Question

if the length of each edge of a cube is doubled, how many times does its volume become? how many times does its surface area become?

Answer 1

let x be side of cube
hence original volume is
${x}^{3}$
now side is doubled that is made 2x
new volume=
${(2x)}^{3} \\ = 8 {x}^{3}$
hence volume becomes 8 times.

similarly we can do with surface area which becomes 4 times