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Question

Answer

Before:

Boys : Girls =  5 : 2  = 15 : 6  

After:

Boys : Girls = 2 : 3  = 4 : 6  (Note there is no change in number of girls) 

Number of boys who left are represented by 15 – 4 = 11 units

Number of boys who left = 32 -10 = 22 

11 units –> 22 children 

1 unit — > 2 children 

Number of children at the start = 15 + 6 = 21 units –> 21 x 2 = 42 (Answer)

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