25. 1% of 100 feet is 1 feet so the largest length is 101 feet and smallest is 99 feet. so difference between largest possible area and smallest possible area = 101^2 - 99^2 =(101-99)(101+99) = 200*2 = 400 square feet.

26.Yumi's Current age is 16 years old. (solved it in the earlier post)

Please post each question separately as its too much time consuming to answer all the question at one go in free section. Please best my answer. Thanks :)