Find the number of spherical bullets of radii is 1 mm each that can be made out of a cylindricalsolid of radius 4 cm and height 6 cm.

Let the number of spherical bullets made = n 
Now volume of n spherical bullets = volume of cylindrical solid 
    n×43×π×rs3 =π×rh2×hn×43×π×(1) =π×(40)2×60    (as 4 cm = 40mm and 6cm = 60 mm)n×43=40×40×60n=40×40×60×34n = 72000 Hence number of spherical bullets = 72000

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