Grandad is 11 equal units. Ed is $$\frac{2}{11}$$ of grandad, so 2 of those units = 12 years.<br><br>[[model:questions/solutions/q3433.png]]<br><br>• Ed = 2 units → 12<br>• 1 unit → 12 ÷ 2 = 6<br>• Grandad = 11 units → 11 × 6 = 66<br><br>His grandad is 66 years old.<br>Check: $$\frac{2}{11}$$ of 66 = 12 = Ed. ✓