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Let number of boys in the class be ‘b’ and number of girls in the class be ‘180 – b’. ATQ; {160 × b + 155 × (180 – b)}/180 = 157 Or, (160b + 155 × 180 – 155b) = 157 × 180 Or, 160b – 155b = 2 × 180 Or, 5b = 360 Or, b = 72 Therefore, number of boys in the class are 72.
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