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How many silver coins, 1.75 cm in diameter and of thickness 2 mm, must be melted to form a cuboid of dimensions 5.5 cm × 10 cm × 3.5 cm?

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Solution: Radius of coin = 0.875 cm, height = 0.2 cm

Dimensions of cuboid = 5.5 cm x 10 cm x 3.5 cm

Volume of coin

10 surface area volume exercise solution

Volume of cuboid = 5.5 x 10 x 3.5 = 192.5 cm3

Number of coins

10 surface area volume exercise solution

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