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If three cubes whose edges measure 3 cm, 4 cm and 5 cm respectively, are melted to form a single cube, then find the edge of the new cube.
Question

If three cubes whose edges measure 3 cm, 4 cm and 5 cm respectively, are melted to form a single cube, then find the edge of the new cube.

A.

4 cm

B.

7 cm

C.

6 cm

D.

5 cm

Correct option is C

Given:

Sides of cubes =  3 cm, 4 cm and 5 cm

Formula used:

Volume of cube = a3

where, a = side of cube

Solution:

Volume of single cube = Total volume of three cubes

 a3 = x3 + y3 + z3

 a3 = 33 + 43 + 53

 a3 = 27 + 64 + 125

 a3 = 216

 a = 6 cm

Then, 

The edge of final cube is 6 cm.

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