English, asked by firdousbibi26, 11 months ago

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?​

Answers

Answered by prasadj48
20

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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