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Answer : 2 84 Explanation : Answer: B) 84 Explanation: Ratio of girls and boys = 100% : 75% = 4:3Difference is 1 unit = 35So, 3 units = 35 x 3 = 105If 20% absent, that’s mean 80% present.So, present boys = 80% of 105 = 80×105100 = 84

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