Give the step-by-step reasoning process and then the final answer. Cara is at her family reunion, where she discovers that she is 20 years younger than her mom. Her mom is 15 years younger than Cara's Grandmother. If Cara's grandmother is 75, how old is Cara?
User
Cara's mom: 75 - 15 = 60 years old. Cara: 60 - 20 = 40 years old.
The final answer: 40.
Assistant