You can solve this math equation using your brain. Solve the puzzles and improve your logical thinking.

**Puzzle:**

1 + 2 = 3

3 + 4 = 21

5 + 6 = 55

4 + 5 = ?

**Options:**

A. 32

B. 34

C. 36

D. 38

**Answer:** C. 36

**Solution:**

1 + 2 = 1 × (1+2) = 3

3 + 4 = 3 x (3+4) = 21

5 + 6 = 5 x (5+6) = 55

4 + 5 = 4 x (4+5) = 36