How many silver coins 1.75cm in diameter and of thickness 2mm, must be melted to form a cuboid of dimensions 5.5cmx10cmx3.5cm?
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d is equal to 1.75 CM and r is equal to 1.75 by 2 and h is equal to 2 mm or 0.2 CM
now volume of cylinder is equal to Pi r square h
hair Payal square h 22 by 7 into 1.75 by 2 into 1.75 by 2 into 0.2 by 10 solving this we will get number of coins as400
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