No clue what to do. show all steps too .

We can create two equations from the information given.

"The perimeter of a rectangular field is 76 m."





"The length is 1 m less than double the width."



Let's plug in this for 'l' in the first equation:



Combine like terms:



Add 1 to both sides:



Divide 3 to both sides:



Plug this into any equation to find the length:





Subtract 77/3 to both sides:





So the width is 77/3 and the length is 151/3. Or we can convert them into mixed numbers: 

,

I'm gonna have to say about 13 percent

What do you mean by that?