Jerry used $$\frac{3}{4}$$ so his money is 4 equal units (1 unit left). Tom used $$\frac{5}{6}$$ so his is 6 equal units (1 unit left). The two leftover units are equal, so all units are the same size.<br><br>[[model:questions/solutions/q5289.png]]<br><br>• Jerry + Tom = 4 + 6 = 10 units → $100<br>• 1 unit → $100 ÷ 10 = $10<br>• Each left → 1 unit = $10<br><br>Each of them had $10 left.<br>Check: Jerry $40 (used $30, left $10); Tom $60 (used $50, left $10); $40 + $60 = $100. ✓