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Start learning 50% faster. Sign in nowLet the number of Boys be ‘x’ Sum of ages of boys = x x 16 Sum of ages of girls = (400 - x ) x 12 According to question, x × 16 + (400 - x) × 12 = 400 × `14 (3/4)` 16x + 4800 - 12x = 400 × `59/4` 4x + 4800 = 5900 4x = 1100 x = 275 Number of girls = 400 - 275 = 125
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