Cup A has 8u and Cup B has 3u. To equalize, pour half the difference (2.5u) from A to B. 2.5u = 50 ml gives 1u = 20 ml.<br><br>[[model:questions/solutions/q4513.png]]<br><br>• Difference → 8 − 3 = 5 units<br>• Half the difference = amount to pour → 5 ÷ 2 = 2.5 units<br>• 2.5 units → 50 ml, so 1 unit → 50 ÷ 2.5 = 20 ml<br>• Cup A at first → 8 × 20 = 160 ml<br>• Each cup in the end → 160 − 50 = 110 ml (or 60 + 50 = 110 ml)<br><br>Each cup had 110 ml of water in the end.<br>Check: 110 ml each, total = 220 ml = 160 + 60. ✓