They started equal. Jerry spent 1 unit, Ben spent 2 units (twice as much). Since both began with the same amount, the difference in what is LEFT equals the difference in what was SPENT = 1 unit.<br><br>[[model:questions/solutions/q4185.png]]<br><br>• Difference left → $18 − $5 = $13<br>• This equals the extra unit Ben spent → 1 unit = $13 (Jerry spent $13, Ben spent $26)<br>• Each at first → Jerry spent + Jerry left = $13 + $18 = $31<br><br>Each of them had $31 at first.<br>Check: Ben $31−$26=$5, Jerry $31−$13=$18, and $26 = 2 × $13. ✓