Boys = 7 units, girls = 8 units. The 7 units of boys are 42, so each unit is 6.<br><br>[[model:questions/solutions/q4480.png]]<br><br>• Boys → 7 units = 42<br>• 1 unit → 42 ÷ 7 = 6<br>• Girls → 8 units = 8 × 6 = 48<br><br>There are 48 girls.<br>Check: 42 : 48 = 7 : 8. ✓