Question

There are 3 numbers. The average of the first two numbers is 12 more than the average of the last two numbers. What is the difference between the first and the last number?
1. 18
2. 24
3. 26
4. 16
5. 25 

Answer 1

Correct Answer - Option 2 : 24

Given:

Average of first two = 12 + Average of last two

Formula used:

Average = sum of observations/total number of observations

Calculation:

Let the numbers be a, b, c

A.T.Q

(a + b)/2 = (b + c)/2 + 12

⇒ a + b = b + c + 24

⇒ a - c = 24

∴ The required difference is 24