If the same functions are applied to teach the results in each of the three sets of numbers given below, then which number will replace the question mark in the third set of numbers ?

Options

A. 24
B. 30
C. 36
D. 40

Answer

B

Explanation

The pattern is as follows:
In the first set, `(21 - 17) xx ((5+7)/(2)) = 24`
In the second set, ` (28 –25) xx ((13+7)/(2)) = 30`
Therefore, missing number in the third set `= (16 - 10)x ((2+8)/(2)) = 30`