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OpenStudy (anonymous):
On one tray of a balanced scale was a 1-kg mass. On the other tray were a box and a 250-g mass. What was the mass of the box?
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OpenStudy (nirmalnema):
both the tray have equal masses.. so 1kg = 250g+x x be the weight of box so x= 1000g-250g (1kg=1000g) =750g
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