Work backwards: 36 packets left is 1/4 of the afternoon remainder. The remainder is 3/5 of the total.<br><br>[[model:questions/solutions/q4332.png]]<br><br>• Left = 36 packets = 1/4 of remainder after morning<br>• Remainder after morning → 36 × 4 = 144 packets<br>• Remainder = 3/5 of total → 1/5 = 144 ÷ 3 = 48<br>• Total cooked → 48 × 5 = 240 packets<br><br>Selvi cooked 240 packets of noodles.<br>Check: Morning = 2/5 × 240 = 96. Remainder = 144. Afternoon = 3/4 × 144 = 108. Left = 144 − 108 = 36. ✓