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 x 10
cm x 3.5 cm?
​

Answer 1

Step-by-step explanation:

Let the number of coin be x

x× volume of 1 coin = volume of box

x×πr

2

h=l×b×h

x×

7

22

×

100×2

175

×

100×2

175

×

10

2

=

10

55

×10×

10

35

x=

22×25×175

55×35×100×100×2

=20×20

=400coins

Answer 2

Volume of coin × n = Volume of cuboid

where n is the number of coins

So by given question

n = Volume of cuboid

Volume of coin

= 5.5 × 10 × 3.5

π × 3.5 × 3.5 × 2

= 192.5

77

= 2.5 coins

check the calculations once

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