if the average of the 1st and the 2nd of three numbers is d more than the aver

Question

if the average of the 1st and the 2nd of three numbers is d more than the average of the 2nd and 3rd number, what is the difference between the 1st and the 3rd number ?

Options:

A . 11

B . 13

C . 15

D . 18

Answer: Option D
Explanation :

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