Question 314609
Let l=length and w=width

The formula for perimeter is P=2l+2w and we know that l=2w+5


70=2l+2w


Now replace the l with 2w+5


70=2(2w+5) + 2w
70=4w+10+2w
70=6w+10
60=6w
w=10


l=2w+5
l=2(10)+5
l=25


So the width is 10, and the length is 25.