Math Is Fun Forum

JohnnyReinB

Member

Registered: 2007-10-08

Posts: 453

Re: 10 second questions

Ok

I don't quite understand no.443

There. I don't know much about chords, though.

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"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted"

Nisi Quam Primum, Nequequam

Daniel123

Member

Registered: 2007-05-23

Posts: 663

Re: 10 second questions

JohnnyReinB

Member

Registered: 2007-10-08

Posts: 453

Re: 10 second questions

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"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted"

Nisi Quam Primum, Nequequam

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

Well done, JohnnyReinB and Daniel123!!!

Daniel123, your answer is correct!
JohnnyReinB, your answers other than $444, #446, #447 and #450 are correct!!!
I have changed two questions. Please see posts edited by me.

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#452. What is the angle of elevation for sun for length of shadow to be same as height of the person?

#453. What is the value of sin²xcos²y+cos²xsin²y+sin²xsin²y+cos²xcos²y?

#454. If

,
what is the value of tanA?

455.12 workers after working 10 hours a day assemble some instruments in 15 days. How many days is required to assemble the same number of instruments if 15 workers are employed working 8 hours a day?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

JohnnyReinB

Member

Registered: 2007-10-08

Posts: 453

Re: 10 second questions

---

"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted"

Nisi Quam Primum, Nequequam

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

You are right, JohnnyReinB! Good!

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#456. A solid sphere is cut into four equal parts. If the curved surface area of each part now is x times that of the sphere, then what is the value of x?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#457. If

,
then what is the value of x?

#458. If the Greatest Common Divisor of p and q is x and q=xy, then the Least Common Multiple of p and q is _________.

#459. The number

is divisible by 11 for
(a) all values of n
(b) even values of n
(c)odd values of n
(d) values of n where n is a multiple of 11.

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#460. What is 1/2+1/4+1/8 expressed as a decimal?

#461. Is 0.101001000100001000001....... a rational number?

#462. Express 1/7 as a decimal rounded off to three places.

#463. A man plants hios orchard with 5776 trees and arranges them so that there are as many rows as there are trees in a row. How many trees are in a row?

#464. What is the unit digit in the product

?

#465. When a number is divided by 296, the remainder is 75. What will be the remainder if it is divided by 37?

#466. What is the sum of all odd numbers between 1 and 32?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

siva.eas

Member

Registered: 2005-09-17

Posts: 166

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

Answers #460 to #466.
siva.eas, All answers other than #460, #465 and #466 are correct!
Well done!

#467. There was food for 50 days for 100 persons. After 10 days, 20 persons left. For how many days will the remaining food be sufficient?

#468. If 3 workers, working 8 hours a day finish the work in 5 days, then one worker, working 10 hours a day, can finish the same work in ___________________ days.

#469. If m men can do a job in d days, then (m+r) men will do the same job in ____________ days.
(a)

(b)

(c)

(d)

#470. A garrison of 200 men had enough food to last for 30 days. After 10 days, 50 more men joined them. How long did the food last them?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#471. Is 6128702 a perfect square?

#472. What is 33.33 ÷ 1.1?

#473. The number nearest to 7671 that is divisible by 38 is ______.

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

JohnnyReinB

Member

Registered: 2007-10-08

Posts: 453

Re: 10 second questions

Last edited by JohnnyReinB (2007-12-25 20:26:56)

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"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted"

Nisi Quam Primum, Nequequam

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

All correct from #471 to #473, JohnnyReinB!!!
Very well done!!!
Try the unanswered questions too!

#474. Which is the smallest number which is a sum of two squares in three different ways?

#475. Which is the smallest cube that is also a sum of three cubes?
(a) 81    (b) 729    (c) 216      (d) 512

#476. What is the sum of factorials from one to six?

#477. Which of the following numbers has the property

?

(a) 2592   (b) 1372   (c)2633  (d) 4718

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#478. How is 500 (decimal system) represented in Octonary system (that is, Base 8)?

#479. 11 in Decimal system is represented by ____ in Hexadecimal system.

#480. 10011 is a number in the binary number system. What is its equivalent in the decimal system?

#481. 2F7 is a number in Hexa-decimal system. What is the number in decimal number system?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

JohnnyReinB

Member

Registered: 2007-10-08

Posts: 453

Re: 10 second questions

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"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted"

Nisi Quam Primum, Nequequam

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

JohnnyReinB,
#478, #480 and #481 correct!
Well done!!!

#482. If

is exactly divisible by 641, which of the following is also divisible by 641?

(a)

(b)

(c)

(d)

#483. If the number 1y3y6 is divisible by 11, what should the digit y be?

#484. Which one of the following is a prime number?
(a) 161   (b) 165    (c) 169   (d) 173

#485. Which of the following numbers is divisible by 15?
(a) 17325   (b) 23751   (c) 29515  (d) 305600

#486. All the prime factors of 182 are
(a) 2 and 7  (b) 2, 7, and 13    (c) 7 and 13   (d) 2 and 13

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#487. What is the Least Common Factor of 12, 15, and 18?

#488. What is the Greatest Common Divisor of 27, 72, and 108?

#489. What is the Least Common Multiple of 2/3 and 4/9?

#490. What is the Greatest Common Divisor of 12/35, 30/49, and 40/63?

#491. What is the figure given below known as?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

JohnnyReinB

Member

Registered: 2007-10-08

Posts: 453

Re: 10 second questions

---

"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted"

Nisi Quam Primum, Nequequam

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

Correct, JohnnyReinB!
Good!

#492. A number is divisible by 25 only if ____________________________________________________.

#493. A prime number greater than 11 will never end with
(a)3   (b)5   (c)7   (d)9

#494.

#495.

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#496. How many squares does picture 1 contain?

#497. How many rectangles does picture 1 contain?

#498. How many triangles does picture 2 contain?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#499. In a class containing 50 students, 10 play basketball but not football, 10 play football but not basketball and 15 play neither basketball nor football. How many students play both basketball and football?

#500. How many triangles does this picture contain?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#501. What is this commonly seen figure known as?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,385

Re: 10 second questions

#502 and #503. What are these figures called?

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.