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2006 AMC 10A 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 many years old is Mary?

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Solution

Since the ratio is 3:53 : 5 and Alice is 30,30, Mary is 35⋅30=18\dfrac{3}{5} \cdot 30 = 18 years old. Thus, the correct answer is B.
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Tagged: ratio and proportion · ages

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