Question

A rectangular area is to be fenced in along a straight river bank as illustrated the lengthy of the fenced in area is to be 7 feet greater than the width and the total amount of fixing it is to be used is 61 feet find the width and Length of the fenced in area

Answer 1

I can't see a picture, so I'm assuming this fencing consists of 2 widths and one length, with the river on the fourth side.
width = w
length = w+7

So perimeter = 2 widths and 1 length
= w + w + w + 7 = 3w + 7

solve equation 3w + 7 = 61

3w = 54

w = 18 and length = 25