SOLUTION: In 1991, the separation between goalpost uprights in college football changed from 23 feet 4 inches to 18 feet 6 inches. What percent reduction was this?

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Question 963996: In 1991, the separation between goalpost uprights in college football changed from 23 feet 4 inches to 18 feet 6 inches. What percent reduction was this?
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
%28%2823+feet+4+inches%29-+%2818+feet+6+inches%29%29%2F%2823+feet+4+inches%29
The numerator represents the reduction in size.
The denominator is the original length.
Convert feet to inches.
%28%2823%2812%29%2B+4+%29-+%2818%2812%29%2B6%29%29%2F%2823%2812%29%2B+4+%29
%28%28276%2B+4+%29-+%28216%2B6%29%29%2F%28276%29%2B+4+%29
%28%28280+%29-+%28222%29%29%2F%28280%29+%29
%2858%2F%28280%29+%29 = 20.71%