Link to the May 2017 Brain Puzzler Solution:

April’s Brain Puzzler

What is the area of the shaded region of the given 8 x 5 rectangle?

What is the area of the shaded region of the given 8 x 5 rectangle?

The area is 6.5 square units.

Using extra lines to break the shape into triangles is a great way to solve this problem.

https://artofproblemsolving.com/wiki/index.php/2016_AMC_10A_Problems/Problem_11