Tony is 1 unit; Andy saved twice as much, so 2 units. Together that is 3 units = $90.<br><br>[[model:questions/solutions/q2281.png]]<br><br>• 3 units → $90<br>• 1 unit → $90 ÷ 3 = $30 (Tony)<br>• Andy = 2 units → 2 × $30 = $60<br><br>Andy saved $60 and Tony saved $30.<br>Check: $60 + $30 = $90, and $60 = 2 × $30. ✓