Question 6:
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? [Use π = 22/7]
Answer:
Coins are cylindrical in shape.
Height (h1) of cylindrical coins = 2 mm = 0.2 cm
Radius (r) of circular end of coins = 1.75/2 = 0.875 cm
Let n coins be melted to form the required cuboids.
Volume of n coins = Volume of cuboids
Therefore, the number of coins melted to form such a cuboid is 400.
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