Question

how many silver coins 1.75cm in diameter and of thickness 0.2cm must be melted to form cuboids of dimensions 5.5cm x `10cm x 3.5cm

Answer 1

Step-by-step explanation:

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Answer 2

We have,

Radius of coin = 1.75/2 = 00.875 cm

Thickness, i.e, height = 2/10 = 0.2 cm

The shape of the coin will be like the shape of cylinder

Volume of the coin = πr²h

Volume of the coin = 22/7 × 0.875 × 0.875 × 0.2

Now, Volume of the cuboid = 5.5 × 10 × 3.5

Therefore, Number of coins required to form a cuboid = Volume of the cuboid/Volume of the coin

Number of coins required to form a cuboid = 5.5 × 10 × 3.5/22/7 × 0.875 × 0.875 × 0.2

Number of coins required to form a cuboid = 400

Hence, There are 400 silver coins melted to form a cuboid.