Please do it.

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Class 9 126
Class 10 162
126 = 2 * 7 * 9 = 18 * 9
162 = 2* 9 * 9  = 18 * 7
HCF = 18

thus if there are 18 parallel rows
with class 9 row having 7 boys and class 10 9 the children can be distributed
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