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 answer step by step:
Megan was the lead actress in 100 * 80% = 80 plays. So Megan was not the lead actress in 100 - 80 = 20 plays. The answer: 20.