Did you get it right?
This rectangle-counting puzzle asks you to count both the small rectangles and the larger combined rectangles.

The Answer
The correct answer is: 18.
Here is why
- 3 by 2 grid total rectangles = 3脳4/2 脳 2脳3/2 = 18
Why people miss it
Most wrong answers come from rushing, skipping a clue, or doing the arithmetic in the wrong order.
What answer did you get before checking?