SOLUTION: The ratio of Tom’s age to Mary is 3:4, if Tom is 15, how old is Mary?

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Question 1125464: The ratio of Tom’s age to Mary is 3:4, if Tom is 15, how old is Mary?
Answer by ikleyn(52787) About Me  (Show Source):
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According to the condition,  Tom is 3x years old, while Mary is 4x years old, where x is the common measure of their ages.


Since  3x = 15  (Tom's age), it implies  x= 15/3 = 5.


Hence, Mary is 4*5 = 20 years old.    ANSWER.