[6 dm] The edge of three cubes of metal is 3dm, 4 dm and 5 dm. They are melted and formed into a single cub

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The edge of three cubes of metal is 3dm, 4 dm and 5 dm. They are melted and formed into a single cube. Find the edge of the new cube?

3 dm

4 dm

5 dm

6 dm

Explanation:
First find the volume of each cube.
Cube A=3^3=27
Cube B=64
Cube C=125.
If they are melted and a new cube is formed, then the volume of this cube is equal to the sum of the volumes of the individual cubes.
So Volume of new cube= 216.
To find the edge of this cube, we find the cube root of 216, as a^3=216, we have a=cu.root of 216.
So the answer is 6dm.

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