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Group A                  B : G = 5 : 4 =  10 : 8

Group B                  B : G = 5 : 1

Pls take note that now group A has 18 units in total which is 3 times total of group B  which has 6 units in total. 

So total units of boys in group A  and group B is 10u + 5u = 15u.

So the possible number of boys must be a multiplier of 15. 

45 is a possible number of boys. 

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