Question

how many silver coins of diameter 1.75cm and thickness 2mm need to be melted to make a cuboid of dimensions 5.5 ×10×3.5 cm?​

Answer 1

Answer:

volume of coboid = 5.5×10.3.5=192.5

thickness of coin 2mm=1/5cm

volume of coin =22/7× 1.75/2×1.75/2×1/5=0.48125

no. of coins = 192.5/0.48125=400

Answer 2

vol of a silver Coin-πr 2h

22x(1.75/2)^2 x2/10/7

22x0.875^2 x 0.2/7=0.48125

vol. of Cuboid=5.5x10x3.5=192.5

No. of Silver Coins =192.5/0.48125

= 400 Silver Coins