Q25 of 35 Page 74

The length of each side of three solid cubes are 3 cm, 4 cm, 5 cm respectively, a new solid is made by melting these three solid cubes. Let us write the edge of the new cube.

volume of 1st cube = 33 = 27 cm3

volume of 2nd cube = 43 = 64 cm3


volume of 3rd cube = 53 = 125 cm3


As, a new solid is made by melting these three solid cubes, So, volume of new cube is the sum of volume of all the 3 cubes.


Thus, volume of new cube = 27 + 64 + 125 = 216 cm3


new edge3 = 63


So, new edge = 6 cm


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