Hey guys, need a hand with a problem.

A cuboid parcel is to be tied with a length of string both across and longways, forming a cross on top of it. The parcel as a length of x, width of x and height of y. The fixed volume is 8000cm cubed.

Find the length, L, of string in terms of x and y.

What is the volume of the box in terms of x and y, and hence find y in terms of x.

Using the previous equation, find the length of string, L, in terms of x only.

What is the minimum length of L?

Thanks.