Question

the edges of three cube of metal are 3 cm,4cm and 5 cm.They are melted and formed into a single cube.Find the edge of the new cube.

Answer 1

here is your answer to the question..

Answer 2

Cube I = 3cm
Cube II = 4cm
Cube III = 5cm

Let the edge of the new cube be a

Vol. (New cube) = Vol. Cube (I+II+III)
a^3 = 3^3 + 4^3 + 5^3
a^3 = 27 + 64 + 125
a^3 = 216
a = 6

So, the edge of the new cube is 6cm

Hope you get it. ......