The age gap is 43 − 11 = 32 years and never changes. When Aunt is thrice Jill's age, the gap is 2 units.<br><br>[[model:questions/solutions/q4191.png]]<br><br>• Gap → 43 − 11 = 32<br>• When Aunt = 3 × Jill: gap = 3u − 1u = 2u → 32<br>• 1u → 32 ÷ 2 = 16 (Jill's future age)<br>• Years → 16 − 11 = 5<br><br>Her aunt will be thrice as old as Jill in 5 years.<br>Check: In 5 yrs, Aunt 48, Jill 16; 48 = 3 × 16. ✓