john is 3 times as old as sam . if john will be twice as old as sam in 9 years , how old was sam two years ago ? Choose the correct option.
A) 2  B) 4  C) 6  D) 8  E) 7

Rationale: j = 3 s after 9 years j + 9 = 2 ( s + 9 ) j = 2 s + 9 2 s + 9 = 3 s s = 9 two years ago s = 9 - 2 = 7 e is the answer
Answer: E