Question

What’s the width and length when the perimeter is 30 ?

Answer 1

Look to the explanation please.

Explanation:

I am assuming you are talking about a rectangle. In that case the problem is unsolvable. There are infinite combinations that satisfy the equation: `"Perimeter"= 2*"width"+2*"length"`
Or in this case: `30= 2*w+2*l`

For this to be solvable another piece of data has to be supplied: either one of the lengths or a relationship between them (such as "the width is three times the length")

For more detailed responses please clarify a little more in your questions in the future!