"Given enough wood to build a fence with a length of 40 feet, how many ways could you build a rectangular fence that encloses an area of at least 80ft squared? ( using a minimum of 1 foot increment)" Source: GREquestionaday.com
The answer = 5 ways ( 10*10, 9*11, 8*12, 7*13 and 6*14)
please any Idea of how they arrived at this answer. they didn't give any further explanation. Thanks.