a cuboid has length 4.2 m breadth 1.4 m and height 1.2 m. find the number of cubes each of lengh 20cm, which canbe cut from the cuboid.

l = 4.2 m = 4.2 * 100 = 420 cm

b = 1.4 m = 1.4*100 = 140 cm

h = 1.2 m = 1.2 * 100 = 120 cm

Volume of cuboid = l*b*h = 420 * 140 * 120 = 705600 cubic cm

Volume of cube = a*a*a = 20*20*20 = 8000 cubic cm

No. of cubes = Volume of cuboid / volume of cube

= 705600 / 8000 = 882 cubes

or 420*140*120 / 20*20*20 = 42*14*12/2*2*2 = 21*7*6 = 882 cubes