Answer:
5
Step-by-step explanation:
let the width be x and length be 6x
Now,
perimeter of rectangle=70
2(l+b)=70
2(6x+x)=70
12x+2x=70
14x=70
x=70/14
x=5
-2/3
4+3x=2
3x=2-4
3x=-2
X= - 2/3
subtraction
it is an increase of 400%