If the length, breadth and height of a cuboid are all increased to 'n'times their original values of 'n'.

Explanation

Volume of the cuboid = `length xx breadth xx height`
Volume of the new cuboid
= `(n xx length) xx (n xx breadth) xx (n xx height)`
= `n^(3) ( length xx breadth xx height)`
Density = `mass/volume`
`8/1=n^(3)/1,n^(3)=8, n=2`