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When it is 1/5 full of water (by weight) a jug weights 560 grams. When it is 4/5 full, the jug weights 740 grams. What does the jug weigh when it is empty?



Let the weight of the jug be x and density of water = y. capacity of jug = 5z cm^3.
hence x+yz=560 and x+4yz=740. solving, we get x=1060g = 1.06 kg.
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