P is three times as old as Q. In 9 years, P will be twice as old as Q. How old was P three years ago? Choose the correct choice from the following options
A) 18
B) 21
C) 24
D) 27
E) 30
P = 3Q so Q = P/3   P+9 = 2(Q+9) = 2(P/3+9)   P/3 = 9   P = 27   Three years ago, P was 24.   The answer is 24.
<result>C</result>
P is three times as old as Q. In 9 years, P will be twice as old as Q. How old was P three years ago?