The train costs $$\frac{3}{4}$$ of the car: car = 4 units, train = 3 units. The 3 units are $42.<br><br>[[model:questions/solutions/q3431.png]]<br><br>• 3 units → $42<br>• 1 unit → $42 ÷ 3 = $14<br>• Car → 4 units = 4 × $14 = $56<br><br>The toy car cost $56.<br>Check: train → $$\frac{3}{4}$$ of $56 = $42. ✓