Book Maths Puzzle Age Problem

If you were 12 years old and your brother was 19 years old how old are both of you in 48 years?

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Book Other Question

A father's age is thirteen times that of his son. In 10 years, the son's age will be one-third of his father's. How old are the father and son? Find the balance of the account. The problem is: $3,800 principal earning 2% compounded quarterly after 7yrs.


I understand how to figure an equation that earns annually but not sure what # to use for quarterly interest
Tk you