Based on this quote, this answer is 60.77.
The ratio given in USD to CHF is 1.4481/88. Since we want 1 USD, we divide both parts of the ratio by 1.4481:
1.4481 ÷ 1.4481 = 1
88 ÷ 1.4481 = 60.77
When you get to the point where the width is larger than the length, you can stop because you have exhausted all the possibilities. The greatest area will be the rectangle that is closer in to a square than any of the others.
V=B+15
V+2B=180
Therefore:
3B+15=180
B=55
V=70
Check:
V+2B=180
70+2(55)=180
70+110=180
180=180. Checks.
Square would be the best answer