Question

the number of solid spheres each of diameter 6 cm that can be made by melting a solid metal cylinder of height 45 cm and diameter 4 cm is
i)3 ii)5 iii)4 iv)6
[with solution]​

Answer 1

volume of cylinder=πr2h= (22/7)(2*2)45= 180π
volume of sphere= (4/3)πr3= (4/3)π(3*3*3)=36π
no of sphere= 180π/(36π)= 5
so the number of sphere is 5

Answer 2

(ii)5....
Volume of cylinder = volume of sphere x n ( no of spheres)
22/7 x 45 x 2 x 2 = 4/3 x 3 x 3 x 3 x n
5 = n