today mary ’ s father is 4 times as old as mary . 3 years ago , he was 5 times as old . how old is mary today ?	Choose the correct choice from the following:
A) 6 B) 8 C) 10 D) 12 E) 14

Rationale: dad ' s age = 4 m 5 * ( m - 3 ) = 4 m - 3 m = 12 the answer is d .
Answer: D