The ratio of Mary's age to Alice's  age is  $3:5$. Alice is 30 years old. How many years old is Mary?
Question:
The ratio of Mary's age to Alice's  age is  $3:5$. Alice is 30 years old. How many years old is Mary?
Answer:
Let's think step by step.

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The ratio of Mary's age to Alice's  age is  $3:5$. Alice is 30 years old. How many years old is Mary?
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