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Ok lets break this problem down, shall we?
We know that a fresh mango contains 70% water by weight. Therefore 20 kg of fresh mangos contain 14 kg of water and 6 kg
of mango "solids".
We also know that dried mangoes contain 10% water by weight. If we have 6kg of mango "solids" that means that in a dried mango there are .6kg of water.
Thus the total weight of the dried mangos is 6.6kg.
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"Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats."
--H.L. Mencken
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