Question

Does any one know the answer?

Answer 1

Use the key to answer the question. 

The model on the left has 6 small white blocks and 1 long black block. 
The model on the right has 5 small black blocks.

6 small white blocks = 6
1 long black block = -x

5 small black blocks = -5

6 + (-x) = -5

Solve for x.
-x = -11
x = 11

The answer is H.