Take the 35 adults out of the 200 first. That leaves boys + girls; girls = 1 unit, boys = 2 units.<br><br>[[model:questions/solutions/q2300.png]]<br><br>• Boys + Girls → 200 − 35 = 165<br>• 3 units → 165<br>• 1 unit (girls) → 165 ÷ 3 = 55<br>• Boys = 2 units → 2 × 55 = 110<br><br>There are 110 boys.<br>Check: girls 55 + boys 110 + adults 35 = 200. ✓