Question

A cuboidal metal of dimensions 44*30*15cm was melted and cast into a cylinder of height 28cm.find its radius

Answer 1

vol. of cuboid = vol. of cylinder
           l*b*h   = 22/7*r^2*h
     44*30*15  = 22/7*28*r^2
                r^2 = 225
                   r = 15 cm   

Answer 2

length of cubiodal rod=44cm
breadth of cubiodal rod=30cm
height of cubiodal rod =15 cm
height of cylinder =28cm


since melt rod melts and recast into cylinder

volume of cubiodal =volume of cylinder
l*b*h=22/7*R*R*h
put the value
R = 15 cm