Average Practice Test 4

Question : 28 of 40

Marks: +1, -0

Of the three numbers, the average of first and second is greater than the average of the second and third by 15. What is the difference between the first and the third of the three numbers?

Validate

Solution:

Let the three numbers be

x_1, x_2

and

x_3

Now,

{x_1+x_2}/2={x_2+x_3}/2+15

⇒{x_1-x_3}/2=15

⇒{x_1-x_3} =30

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