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ATQ, Let the number of boys in the class be 'B'. So, the number of girls in the class = (20 - B) (B × 8) + {(20 - B) × 4} = 120 Or, 8B + 80 - 4B = 120 So, 4B = 40 So, 'B' = 40 / 4 = 10 So, number of boys in the class = 10
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