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Question

Cubes A, B, C having edges 18 cm, 24 cm and 30 cm respectively are melted and moulded into a new cube D. Find the edge of the bigger cube D.

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Solution

We have the following:Length of the edge of cube A=18 cmLength of the edge of cube B=24 cm Length of the edge of cube C=30 cmThe given cubes are melted and moulded into a new cube D. Hence, volume of cube D=volume of cube A+volume of cube B+volume of cube C=(side of cube A)3+(side of cube B)3+(side of cube C)3=183+243+303=5832+13824+27000=46656 cm3Suppose that the edge of the new cube D=xx3=46656x=466563=36 cm The edge of the bigger cube D is 36 cm.

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