Ricky is 3 equal units; Mif is 1 unit. Take Ben’s 33 kg out of the 117 kg first, leaving Ricky + Mif = 4 units.<br><br>[[model:questions/solutions/q2549.png]]<br><br>• Ricky + Mif → 117 − 33 = 84 kg<br>• 4 units → 84 kg<br>• 1 unit → 84 ÷ 4 = 21 kg<br><br>Mif is 21 kg.<br>Check: 21 + 63 (Ricky) + 33 (Ben) = 117 kg. ✓