【正确答案】 D

【答案解析】Use TACTIC 1: backsolve starting with C. If Alison is now 24, Jeremy is 8, and 5 years ago, they would have been 19 and 3, which is more than 5 times as much. Eliminate A, B, and C, and try a bigger value. If Alison is now 30, Jeremy is 10, and 5 years ago, they would have been 25 and 5. That's it; 25 is 5 times 5. **If Jeremy is now x, Alison is 3x, and 5 years ago they were x- 5 and 3x- 5, respectively. Now, solve: 3x- 5 = 5(x- 5) [*] 3x- 5 = 5x- 25[*] 2x=20[*]x= 10[*]3x=30.