Cool Joe is 39. In 3 years he will be 42, which is 6 times his daughter's age.<br><br>[[model:questions/solutions/q4189.png]]<br><br>• Joe in 3 yrs → 39 + 3 = 42<br>• Daughter in 3 yrs → 42 ÷ 6 = 7<br>• 5 units → 42 − 7 = 35; 1 unit → 7<br>• Daughter now → 7 − 3 = 4<br><br>Cool Joe's daughter is 4 years old.<br>Check: In 3 yrs, Joe 42, daughter 7; 42 = 6 × 7. ✓