Question:
Karen is 6 years older than her sister Michelle, and Michelle is 2 years younger than their brother David. If the sum of their ages is 62, how old is Michelle?
A
18
Explaination
Let: x = Michelle's age
x + 6 = Karen's age
x + 2 = David's age
State the problem in an equation:
x + x + 6 + x + 2 = 62
3x + 8 = 62
3x + 8 - 8 = 62 - 8
3x = 54
3x ÷ 3 = 54 ÷ 3
x = 18
This is Michelle's age.