Question

how many silver coins 2 cm in diameter and of thickness 2 mm must be melted to form a showpiece in the form of frustum of a cone having height 9cm and radii of outside circular ends as 5cm & 3cm CBSE ​

Answer 1

Answer:

735

Step-by-step explanation:

Volume of 1 coins x Number of coins = Volume of frustum

(1/3) * π * h * (r² + (r x r1)  + r1²) =  πr²h

1/3  x 9 ( 9 + 15 + 25) = 2/10 x Number of coins

3 x 49 = 2/10 x Number of coins

1470/2 = number of coins

735 = Number of coins

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