After Ali gives 4 marbles to Kai and Raju loses 12 marbles, all three have the same number.<br><br>
[[model:questions/solutions/q5422.png]]<br><br>
&bull; Total marbles after changes = 84 − 12 = 72 (Raju's 12 are lost, not given)<br>
&bull; Each boy at the end = 72 ÷ 3 = 24 marbles<br>
&bull; Ali at first = 24 + 4 = 28 (he gave 4 to Kai)<br>
&bull; Kai at first = 24 − 4 = 20 (he received 4 from Ali)<br>
&bull; Raju at first = 24 + 12 = 36 (he lost 12)<br>
&bull; Ratio = 28 : 20 : 36 = 7 : 5 : 9<br>
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Final Answer: 7 : 5 : 9