Question

1. Abby, Bridget, and Cathy are sisters. Bridget is one year

older than Cathy. Abby is three times older than Bridget.
Together the sisters are 24 years old. How old is Abby?
Let c represent Cathy's age.

Answer 1

4 years old

Explanation:

cathy=c

bridget=c+1

abby=3c+3

c+c+1+3c+3=24

5c=20

c=4