Question

Amanda is 15 years old. She has two sisters, Britney, who is 12 years old, and Caitlin, who is the youngest. Amanda's age is equal to 3 times the difference of Britney's age and Caitlin's age. How old is Caitlin? A. 3 years old B. 5 years old C. 7 years old D. 12 years old

Answer 1

If Caitlin is...

A. 3 years old, the difference between her and Caitlin would be 9 years. That times 3 is 27. Not Amanda's age.

B. 12 - 5 = 7 (difference) 7 * 3 = 21 is not Amanda's age.

C. 12 - 7 = 5 5 * 3 = 15 = Amanda's age!

Correct answer is C