Skip to main content

2006 AMC 12A Problem 3

Problem 3 of 25EasierAlgebraArithmetic

The ratio of Mary’s age to Alice’s age is 3:5.3 : 5. Alice is 3030 years old. How old is Mary?

Answer choices

Show solution

Solution

Mary’s age is 35\tfrac{3}{5} of Alice’s, so Mary is 35⋅30=18\tfrac{3}{5}\cdot 30 = 18 years old. Thus, the correct answer is B.
AoPS wiki

Tagged: ratio and proportion · ages

More practice