Question

the edge of a cube is increased from X cm to 2X cm , so its volume increases from Y cm 3 to ______________ cm cube

Answer 1

edge of the old cube = x cm
so ,
old volume= x³ = y cm³
now ,
edge of the new cube = 2x cm
so,
new volume = (2x)³
> 8x³
but x³= y
so,
> 8y
hence, the new volume is 8y cm³.

Answer 2

8y cm³ is correct..
thanks..