Megan is an actress. She was the lead actress in 80% of her work. In total, Megan participated in 100 plays. How many times Megan was not the lead actress?
Let’s work this out in a step by step way to be sure we have the right answer.
20
Megan was the lead actress in 100 * 80% = 80 plays.

So Megan was not the lead actress in 100 - 80 = 20 plays.

.

So, the answer is 20