Question

find the number of coins 1.5 cm in diameter and 0.2 cm thick To be melted to form a right circular cylinder of hight 16 cm and diameter 6 cm ​

Answer 1

Volume of cylinder = πr^2h

Number of coins = n

Volume of coins × n = Volume of cylinder

πr^2h × n = πr^2h

22/7×1.5/2×1.5/2×0.2×n = 22/7×3×3×16

0.1125×n = 144

n = 1280

So the numbet of coins that to be melted to form a right circular cylinder are 1280.