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OpenStudy (anonymous):
When a bottle is 1/2 filled with water, it weighs 2.6kg. The bottle weighs 4kg when it is full. Find the weight of the empty bottle.
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OpenStudy (welshfella):
let weight of empty bottle be x and weight of water when bottle is full be y then we have x + y = 4 and x + 0.5y = 2.6
OpenStudy (welshfella):
solve this system for x
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