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

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

A 15 m

B 4 m

C 6 m

D 9 m

Solution

Correct Answer: Option C

The edge of the new cube is = \(3^3+4^3+5^{3\;}=\;a^3\) => a = 6 m.