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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? Q.6

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Today i am solving the important question of ncert class 10 surface areas and volumes . Find the easiest and simplest way to solve the exercise 13.3 question number 6 and also find the best solution of this question .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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### 2 Answers

1. It is known that the coins are cylindrical in shape.

So, height (h1) of the cylinder = 2 mm = 0.2 cm

Radius (r) of circular end of coins = 1.75/2 = 0.875 cm

Now, the number of coins to be melted to form the required cuboids be “n”

So, Volume of n coins = Volume of cuboids

n × π × r× h1 = l × b × h

n×π×(0.875)2×0.2 = 5.5×10×3.5

Or, n = 400

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2. This is the video solution for Chapter 13| Exercise 13.3| Q 6- | Surface area and volume NCERT maths solutions class 10 | Truemaths. I hope this helps.

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