Find the missing number?

A. 15

B. 16

C. 18

D. 21

Answer: Option B

Solution(By Examveda Team)

Working in columns, starting with the top number, add 4 to give the next value down, and add 5 to give the one under that. So,

In Third Column:
7 + 4 = 11 and
11 + 5 = 16.
Missing element = 16.