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 Choices**

A. 15

B. 18

C. 20

D. 24

E. 50

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 Choices**

A. 15

B. 18

C. 20

D. 24

E. 50