Question

Three metal cubes whose edge measure 3cm,4cm, and 5cm respectively are melted to form a single cube, find its edge.

Answer 1

first find the volume of the cubes which is 27 64 and 125
add the volumes it is 216
a3=216
a=cube root of 216=6 cm

Answer 2

Vol. of three cubes = Vol. of one big cube.
3X3X3+4X4X4+5X5X5=x³
27+64+125=x³
216=x³
x=∛216=6cm