Sample Problem

Ann’s grandmother is 5 times as old as Ann. Ann’s mother is 3 times as old as Ann. What is the ratio of Ann’s age to his mother’s age to her grandmother’s age?

: :


Set Ann’s age as 1 unit. Then, her mother’s age is 3 units, and her grandmother’s age is 5 times.

Thus, the comparison can be expressed as the ratio of 1:3:5.