Difference between revisions of "1985 AJHSME Problem 19"
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Revision as of 21:36, 31 January 2021
Problem
If the length and width of a rectangle are each increased by , then the perimeter of the rectangle is increased by
Solution
Let the length and width of the original rectangle be and
respectively. The area of the original rectangle is
If we apply the changes as described in the problem, the area of the new rectangle is
This is an area increase of 21%, so the answer is