Inequalities math homework problem

[xCanx]

A rectangular solid is to be constructed with a special kind of wire along all
the edges. The length of the base is to be twice the width of the base. The
height of the rectangular solid is such that the total amount of wire used (for
the whole figure) is 40 cm. Find the range of possible values for the width of
the base so that the volume of the figure will lie between 2 cm3 and 4 cm3.
Write your answer correct to two decimal places.

Can someone show me how to start off?

 

[symbolipoint]

w=width, L=length, h=height;

w+L+h=40, L=2w

wLh>2 and wLh<4