John was thrice as old as Tom 6 years ago. John will be 3/2 times as old as Tom in 6 years. How old is Tom today? Choices
A) 6  B) 8  C) 10  D) 12  E) 14
J-6 = 3(T-6), so J = 3T-12   J+6 = 3/2 * (T+6)   2J + 12 = 3T + 18   2(3T-12) + 12 = 3T + 18   3T = 30   T = 10   The answer is 10.
<result>C</result>
John was thrice as old as Tom 6 years ago. John will be 3/2 times as old as Tom in 6 years. How old is Tom today?