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 x 10 cm x 3.5 cm?
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Answer:
400
Explanation:
Given, Diameter of coin = 1.75 cm.
Then, radius = 0.875 cm.
Thickness = 2 mm = 0.2 cm.
Given, Dimensions of cuboid = 5.5 * 10 * 3.5
= 192.5 cm³.
Volume of coin = πr²h
= (22/7) * (0.875)² * 0.2
= 0.48125.
Volume of cuboid = l * b * h
= 5.5 * 10 * 3.5
= 192.5
Therefore:
Number of coins = 192.5/0.48125
= 400.
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