If the average of two numbers A and B is 10. The average of two numbers B and C is 12. The average of numbers A and C is 11. Then what number is A ?

Challenger App

No.1 PSC Learning App

★

★

★

★

★

1M+ Downloads

If the average of two numbers A and B is 10. The average of two numbers B and C is 12. The average of numbers A and C is 11. Then what number is A ?

A10

B12

C8

D9

Answer:

D. 9

Read Explanation:

A+B/2 = 10 A+B = 20 ---(1) B+C/2=12 B+C=24 ---(2) A+C/2=11 A+C=22 --(3) 2-1 = C-A = 4-4 A+C=22-3 3-4 => 2A=18 A=9

Read more in App

Related Questions:

If m and n are positive integers and 4m + 9n is a multiple of 11, which of the following is also a multiple of 11?

If $x ^ 2 + 1 / x ^ 2 = 79$ find the value of $x + 1 / x$

Which among the following is a point on the line joining the points (4,3) and (7,9) ?

If $a+b=\frac{7}{3}$ and $a^2+b^2=\frac{31}{9},$ find $27(a^3+b^3)$

An NGO was formed to help poor patients admitted to a hospital. They collected fund as contribution and decided to distribute the collection equally as a multiple of 1000 to the patients. They also wanted to keep some amount towards their organisational expenses. When they counted the contribution, it was found that if the amount is to be distributed equally (as multiple of thousand ) among 7 patients Rs.5,000 will be left, if distributed equally to 5 people Rs 4,000 will be left and if distributed equally to 2 people, nothing will be left. If they decide to help 5 people , what is the minimum amount each will receive ?