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If there were u boys in each group, there were ( u + 5) girls in each group.

Total number of students were 4u + 5 ( u + 5) =9u + 25

Given 3/8 * ( 9u + 25 ) = 4u

27u + 75 = 32u

5u = 75

u = 15

9u + 25 = 160

Total students were 160

 

 

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