Ken has $20 less than John. Leo has $15 less than Ken. Work down the chain.<br><br>[[model:questions/solutions/q2085.png]]<br><br>• Ken → $45 − $20 = $25<br>• Leo → $25 − $15 = $10<br><br>Leo has $10.<br>Check: Leo $10 + $15 = Ken $25; Ken $25 + $20 = John $45. ✓