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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