Q. 43.9( 18 Votes )

# Find the number of coins, 1.5 cm in diameter and 0.2 cm thick, to be melted to form a right circular cylinder with a height of 10 cm and a diameter of 4.5 cm.

Answer :

Volume of coin = r^{2}h =

Volume of cylinder = r^{2}h =

Therefore,

Total number of coins =

=

= 450 coins

Thus, 450 coins must be melted to form the required cylinder

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