Posted by tina on Sunday, December 5, 2010 at 10:49pm.
A rectangular skating rink measuring 30m by 20m is doubled in area by adding a strip at one end of the rink and a strip fo the same width along one side of the rink. Find the width of the strips if the enlarged rink is still rectangular.

math  Henry, Tuesday, December 7, 2010 at 6:31pm
A = (30 + X) (20 + X) = 2(30 * 20),
X^2 + 30X + 20X + 600 = 1200 m,
X^2 + 50X + 600 = 1200,
X^2 + 50X + 600  1200 = 0,
X^2 + 50X  600 = 0,
Factor the Eq:
(X  10) (X + 60) = 0,
X  10 = 0,
X = 10.
X + 60 = 0,
X = 60.
Use the positive value of x:
X = 10 m = width of strips added,
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