Find the Missing Number?

Answer: D

Solution:

The Sum of all the numbers in every row is 20.

2 + 3 + 7 + 8 = 20 ( Last Row ) 

4 + 7 + 9 = 20  ( 2nd Last Row ) 

11 + 9 = 20  ( 2nd Row ) 

 Hence the value of  “?”  must be 20