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#8651 2020-02-09 00:29:48

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7706. The average age of a husband and wife, who were born 7 years ago, was 25 years at the time of their marriage. Now, the average age of family, including husband, wife, and a child (born during the interval) is 22 years. What is the present age of the child?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8652 2020-02-11 00:53:26

ganesh
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Re: 10 second questions

Hi,

#7707. There were 24 students in a class. One of them, who was 18 years old, left the class and his place was taken by a newcomer. If the average of the class was thereby lowered by 1 month, find the age of the newcomer.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8653 2020-02-13 00:30:04

ganesh
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Re: 10 second questions

Hi,

#7708. 19 persons went to a hotel for a combined dinner party. 13 of them spent $79 each on their dinner and the rest spent $4 more than the average expenditure of all the 19. What is the total money spent by them (approximately)?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8654 2020-02-14 04:45:13

math9maniac
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Posts: 443

Re: 10 second questions

Last edited by math9maniac (2020-02-14 05:31:40)


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#8655 2020-02-14 15:58:11

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

Good attempt, math9maniac!

#7709. The average of five positive numbers is 213. The average of the first two numbers is 233.5 and the average of the last two numbers is 271. What is the third number?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8656 2020-02-16 00:50:21

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7710. If

then find the value of


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8657 2020-02-18 00:40:50

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7711.27 pens are divided among Amy, Ursula, and Gia such that the ratio of pens with Amy and Ursula is 1:2 and that with Ursula and Gia is 4:3. How many pens did Amy get?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8658 2020-02-20 00:24:04

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7712. A certain amount of money was divided between Sam and Ben in the ratio 2:3. If Sam's share is $2400, find Ben's share.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8659 2020-02-21 04:02:09

math9maniac
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Posts: 443

Re: 10 second questions


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#8660 2020-02-21 04:13:34

math9maniac
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From: Tema
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Posts: 443

Re: 10 second questions

ganesh wrote:

Hi,

Solution #7708
Good attempt, math9maniac!

Dear ganesh,

Thanks for sharing your solution. I think the answer can be 1536 if each of the remaining 6 spent 4 more than the average. Since, the question didn't indicate anything about each, I worked it as the combined 6/. The question stated "13 of them spent $79 each on their dinner and the rest spent $4 more than the average expenditure of all the 19." The 'each' clause was only stated for the 13, but 'the rest [6 pf them] spent $4 more than the ...

I would love your feedback on this. Many thanks


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#8661 2020-02-21 16:20:56

ganesh
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Posts: 31,221

Re: 10 second questions

Hi math9maniac,

Your interpretation #7708 is beyond my comprehension.

Solution #7712 is correct. Neat work!

#7713. If 45% of a number is added to another number, the first number becomes 1.35 times of the other number. What is the ratio of these two numbers?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8662 2020-02-23 00:22:11

ganesh
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Re: 10 second questions

Hi,

#7714. The first, second, and fourth term of a proportion are 3, 17, and 51. Find the third term.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8663 2020-02-25 00:32:26

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7715. Given 9, m, m, 36 are in proportion. Find the value of m.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8664 2020-02-27 00:21:35

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7716. The ratio of the number of males to females in a town is 10:9. If the number of females is 8181, find the total population of the town.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8665 2020-02-29 01:09:48

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7717. Find the mean proportion of 0.02 and 0.32.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8666 2020-03-01 00:12:25

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7718. Find the mean proportion between the numbers 8 and 18.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8667 2020-03-03 00:07:20

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7719. 150 kilograms of rice last for 30 days for 6 soldiers. If 4 more soldiers join the group, then the amount of rice would last for how many days?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8668 2020-03-03 01:33:37

math9maniac
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Posts: 443

Re: 10 second questions


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#8669 2020-03-03 02:37:03

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

Neat work, math9maniac!

#7720. A typist types 100 pages in 3 working daysh hours a day. How many hours a day would she have to work in order to complete the work in 2 days?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8670 2020-03-05 00:26:17

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7721. If 15 men can do a piece of work in 24 days, in how many days would 12 men do the same work?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8671 2020-03-07 00:20:14

ganesh
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Posts: 31,221

Re: 10 second questions

Hi,

#7722. If 100 laborers can build a wall in 6 days then how many more labors are required to build the same wall in 4 days?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8672 2020-03-09 00:25:53

ganesh
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Registered: 2005-06-28
Posts: 31,221

Re: 10 second questions

Hi,

#7723. If 11 typists type 220 pages in 10 days, then how many pages would 12 typists type in 20 days?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8673 2020-03-11 00:13:13

ganesh
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Registered: 2005-06-28
Posts: 31,221

Re: 10 second questions

Hi,

#7724. A stock of food grains would last for 24 weeks for a group of 250 soldiers. If at the end of 15 weeks, 200 new soldiers join the group. How long the remaining stock of food grains last for?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8674 2020-03-13 00:38:28

ganesh
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Registered: 2005-06-28
Posts: 31,221

Re: 10 second questions

Hi,

#7725. The ratio of age of A and B is 4:3. Four years ago, the ratio was 10:7. Find the present age of A and B respectively.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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#8675 2020-03-15 00:38:40

ganesh
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Registered: 2005-06-28
Posts: 31,221

Re: 10 second questions

Hi,

#7726. The ratio of age of A and his father is 1:7. The difference between their ages is 30 years. What would be the ratio 10 years later?


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

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

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