The age gap is 29 years and never changes. In 4 years, Sarah is twice Jimmy's age.<br><br>[[model:questions/solutions/q4190.png]]<br><br>• Gap → Sarah − Jimmy = 29 years always<br>• In 4 yrs: Sarah = 2u, Jimmy = 1u; 1u → 29<br>• Jimmy in 4 yrs → 29; Sarah in 4 yrs → 58<br>• Now: Jimmy = 29 − 4 = 25, Sarah = 58 − 4 = 54<br><br>Sarah is 54 years old and Jimmy is 25 years old.<br>Check: Gap = 54 − 25 = 29. In 4 yrs: 58 ÷ 29 = 2. ✓