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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