Question

when lucy was 6 years old, her sister was half her age. if lucy was turning 40 today, how old is her sister?

Explanation:

Step1: Find sister's age when Lucy was 6

When Lucy was 6, sister's age was $\frac{6}{2}=3$.

Step2: Calculate age difference

The age difference between Lucy and her sister is $6 - 3 = 3$ years.

Step3: Find sister's age when Lucy is 40

When Lucy is 40, sister's age is $40 - 3 = 37$.

Answer:

37