Adults are 12 units, girls 1 unit, boys 3 units. There are 6 more boys than girls, which is 2 units.<br><br>[[model:questions/solutions/q4492.png]]<br><br>• Difference between boys and girls → 3 − 1 = 2 units<br>• 2 units → 6 children<br>• $$\frac{1}{1}$$ unit → 6 ÷ 2 = 3<br>• Adults → 12 × 3 = 36<br><br>There are 36 adults on the plane.<br>Check: Girls = 1 × 3 = 3, Boys = 3 × 3 = 9. Boys − Girls = 9 − 3 = 6. ✓