Question

how many lead balls each of radius 3 cm can be made by melting a bigger ball of radius 15cm

Answer 1

volume of big ball = πr^3(4/3)

= 3.14×15×15×15(4/3)

= 14142.86 cubic cm

volume of smaller ball = 3.14×3×3×3(4/3)

= 113.04 cubic cm

number of small balls that could be made from one big ball = n (let)

so Now ,

volume of 1 big ball = volume of n small balls

14142.86 = n × 113.04

n = 14142.86/113.04 = 125.11

n= 125 , ballz can be made