Question

How many spherical bulets, each of diameter 1.5 cm ,can be made by melting a cylinder of lead having radius of base 5cm and height 18cm.

Answer 1

let n spherical bullets be made,

then

n×volume of one bullet=volume of cylinder,

n×4/3π(1.5)³=π×(5)²×18,

n×4/3×3/2×3/2×3/2=25×18,

n×9/2=25×18,

then

n=25×18×2/9,

n=25×2×2,

n=100