18 boxes of nails weigh equally and their total weight is 4912 kg. How much does each box weigh?
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Solution
Weight of 18 boxes of nails = 4912 kg = 992 kg ∴ Weight of 1 box = 992÷18 kg = 992×118 kg [∵ Reciprocal of 18 = 118] = 99×12×18 kg = 11×12×2 kg =114 kg = 234 kg Hence, the weight of each box is 234 kg.