Split the 15 pies into 3 equal units. Two of those units were sold.<br><br>[[model:questions/solutions/q3399.png]]<br><br>• 3 units → 15<br>• 1 unit → 15 ÷ 3 = 5<br>• Sold = 2 units → 2 × 5 = 10<br><br>10 pies were sold.<br>Check: $$\frac{2}{3}$$ of 15 = 10. ✓