Math Is Fun Forum

JaneFairfax

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Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

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Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answer to #705:
Correct, JaneFairfax!

#711. Find the value of x if

#712. If the area of a rectangle is 2x²+7x+3 square units, what is its perimeter?

#713. The area of a trapezium is 168 m² and the distance between the parallel sides is 8m. Find the length of the parallel sides if they are in the ratio 3:4.

#714. A square of 25 square centimeters is made up of 25 smaller squares of 1 cm² each as given in the diagram below. Calculate the distance along the given path.

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answer to #711:
Correct, JaneFairfax! Well done!

#715. The perimeter of the floor of a hall is 250 meters. If the height is 4 meters, find the cost of painting the four walls at the rate of $2 per square meter.

#716. Two cubes each with 12 centimeters edge are joined end to end. Find the surface area of the resultant cuboid.

#717. Find the edge of a cube whose volume is equal to that of a cuboid of dimensions 63 centimeters, 56 centimeters and 21 centimeters.

#718. The height of a cylinder is 15 centimeters and the curved surface area is 660 cm². Find the radius.

#719. Simplify:

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answer to #715:
Please try again, JaneFairfax!

#720. If 'n' is a Natural number, what is the value of

?

#721. Consider the following two statements, A and B:
A : 1729 is the smallest natural number that can be expressed a sum of two cubes (of natural numbers) in two different ways.
B : 325 is the smallest natural number that can be expressed as a sum of two squatres (of natural numbers) in three different ways.
Pick the right answer:
(a) Both A and B are true
(b) Only A is true
(c) Only B is true
(d) Both A and B are false

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Oops. I divided instead of multiplying.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Thats better, JaneFairfax!

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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: 48,413

Re: 10 second questions

#722. If 9³ is subtracted from the square of a
number, the answer so obtained is 567. What is the
number?

#723. What is the least number to be added to 4321
to make it a perfect square?

#724. In an examination it is required to get 40% of
the aggregate marks to pass. A student gets 261 marks
and is declared failed by 4% marks. What are the
maximum aggregate marks a student can get?

#725. . Pinku, Rinku and Tinku divide an amount of
$4,200 amongst themselves in the ratio of 7 : 8 : 6
respectively. If an amount of $200 is added to each of
their shares, what will be the new respective ratio of
their shares of amount?

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answers to #722, #723, and #725:-
Excellent, JaneFairfax! All the answers are correct!

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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: 48,413

Re: 10 second questions

#726. A canteen requires 112 kgs of wheat for a week. How many kgs of wheat will it require for 69 days?

#727. The difference between 42% of a number and 28% of the same number is 210. What is 59% of that number?

#728. In an examination it is required to get 40% of the aggregate marks to pass. A student gets 261 marks and is declared failed by 4%. What is the maximum aggregate marks a student can get?

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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: 48,413

Re: 10 second questions

Answers to #726, #727, and #728:
All correct, JohnnyReinB! Very well done!
The same question posted in #724 and #728 was by oversight. Apology!

#728A. An urn contains 4 green and 7 blue marbles. If three
marbles are picked at random, what is the probability that
only two of them are blue?

#729.

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answer to #729:
You are correct, JaneFairfax! Good!

#730: What is the value of x if

#731. 53% of 120 + 25% of 862 = ?% of 500

#732. 14 × 18.6 ÷ 12 + 19.3 = ?

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answer to #730:
Brilliant, JaneFairfax

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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: 48,413

Re: 10 second questions

#733. Find the value of

#734. If a=100 and b=10, find the the value of

#735. Find the distance of the straight line joining the midpoint of  (-7, -2, 1 ) and (-13, -18, 6) and the origin.

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answer to #733:

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,413

Re: 10 second questions

Answer to #734:
Correct, JaneFairfax! Good!

#736. Which among

is the largest?

#737. The length, breadth and height of a room are in the ratio 3 : 2 : 1. If the breadth and height are halved while the length is doubled, then by what percentage would the total area of the four walls of the room change?

#738. When you reverse the digits of the number 13, the number increases by 18. How many other two-digit numbers increase by 18 when their digits are reversed?

#739. Find the quadratic equation whose roots are 3 and -2.

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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.

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: 10 second questions

Last edited by JaneFairfax (2008-05-28 22:49:34)

JohnnyReinB

Member

Registered: 2007-10-08

Posts: 453

Re: 10 second questions

Last edited by JohnnyReinB (2008-05-28 22:57:10)

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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