Answer :

Let the number of boys in the class be x.

The number of girls in the class = .


The total number of pupils in the class = 40.


According to the given condition,



3x + 5x = 200 (Multiplying throughout by 5)


8x = 200


x = (Transposing 8 to RHS)


x = 25


The number of boys in the class is 25.


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