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The number of children in a camp is x and their average weight is 20 kg. If 5 children each weighing 12 kg, join the camp or if 10 children each weighing 21 kg leave the camp, the average weight in both the cases remain the same. The value of x is
18
16
15
14
(20x + 60)/x + 5 = (20x - 21×10)/ x - 10 10(2x + 6) × (x - 10) = 10(2x - 21) × (x + 5) 2x^2 - 20x + 6x - 60 = 2x^2 +10 - 21x - 105 x = 15
By: Amit Kumar ProfileResourcesReport error
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