The age gap never changes: 39 − 9 = 30 years. At the time Mr Lim is 3 times as old, Japh = 1 unit and Mr Lim = 3 units, so the 2-unit gap is that 30 years.<br><br>[[model:questions/solutions/q4188.png]]<br><br>• Mr Lim − Japh = 2 units → 30<br>• 1 unit (Japh) → 30 ÷ 2 = 15<br>• Mr Lim = 3 units → 3 × 15 = 45<br><br>Mr Lim will be 45 years old.<br>Check: Japh 15, Mr Lim 45 = 3 × 15, and 45 − 15 = 30. ✓