Question

three cube of a metal whose edges are 3 cm ,4 cm and 5 cm respectively , are melted into a single cube . what will be the edge of the new cube​

Answer 1

Answer:

The volume get by these 3 edges of cubes is equal to the new cube

1. Vol. of these cubes=3^3+4^3+5^3
2. Vol.= 27+64+125
3. Vol.= 216
4. Vol. of new cube=a^3
5. 216=a^3
6. cube under 216=a
7. therefore a=6
8. Side of new cube is 6.