P is three times as old as Q. In 11 years, P will be twice as old as Q. How old was P three years ago?
Options:
A) 21  B) 24  C) 27  D) 30  E) 33
P = 3Q so Q = P/3   P+11 = 2(Q+11) = 2(P/3+11)   P/3 = 11   P = 33   Three years ago, P was 30.   The answer is 30.
<result>D</result>
P is three times as old as Q. In 11 years, P will be twice as old as Q. How old was P three years ago?