Posted by tony on Saturday, January 15, 2011 at 4:40pm.
a rectangle is 4 times as long as it is wide. a second rectangle is 5 centimeters longer and 2 centimeters wider than the first. the area of the second rectangle is 530 square centimeters greater than the first. what are the dimensions of the original rectangle?

math  Damon, Saturday, January 15, 2011 at 5:22pm
L = 4 B
L2=L + 5
B2=B + 2
(L+5)(B+2) = LB +530
L B + 5B + 2 L + 10 = L B + 530
5 B + 2 L = 520
but L = 4 B
so
5 B + 8 B = 520
13 B = 530
B = 40.8
L = 163
LB = 6648
(L+5)(B+2) = 7174
difference = 525.6 pretty close

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