In 10 years, P will be as old as Q is now. Forty years ago, Q was twice as old as P was then. How old is P now?  Select:
A) 30
B) 35
C) 40
D) 45
E) 50
Q = P+10   Q-40 = 2(P-40)   P-30 = 2P-80   P = 50   The answer is 50.
<result>E</result>
In 10 years, P will be as old as Q is now. Forty years ago, Q was twice as old as P was then. How old is P now?