The bag is one unit (the wallet) plus an extra $7. The two together make $180.<br><br>[[model:questions/solutions/q2425.png]]<br><br>• 2 units + $7 → $180<br>• 2 units → $180 − $7 = $173<br>• 1 unit (wallet) → $173 ÷ 2 = $86.50<br><br>The wallet cost $86.50.<br>Check: $86.50 + $93.50 = $180, and $93.50 − $86.50 = $7. ✓