P is three times as old as Q. In 12 years, P will be twice as old as Q. How old was P three years ago?
Choose the correct choice from the following:
A) 21	B) 24	C) 27	D) 30	E) 33
P = 3Q so Q = P/3   P+12 = 2(Q+12) = 2(P/3+12)   P/3 = 12   P = 36   Three years ago, P was 33.   The answer is 33.
<result>E</result>
P is three times as old as Q. In 12 years, P will be twice as old as Q. How old was P three years ago?