Question

Lillian's grandfather has a very old pet tortoise. He told Lillian that the tortoise was 61 years old when she was born 10 years ago. Lillian is amazed and wants to know how old the tortoise is now.

Which equation can Lillian use to find the tortoise's age t?

Answer 1

71

Explanation:

Since the tortoise was 61 years old 10 years ago we will add 61 + 10.

61 + 10 = 71.