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Posted by on Wednesday, February 3, 2010 at 10:23am.

A rectangular pad of concrete is outlined by a 52-m stripe of paint. Find the dimensions of this pad if the surface area is 168m^2.

drwls: Is there any way you can explain why you did what you did? I don't understand. You had this:

2 (L + W) = 52 (perimeter)
L*W = 168 (area)

2*168/W + 2W = 52
168/W + W = 26
W^2 - 26W = 168
(W-14)(W-12) = 0

W = 14 or 12 m
If W = 12, L = 14 and vice versa

The pad dimensions are 14 x 12 m.

  • Math - , Wednesday, February 3, 2010 at 11:03am

    The first two equation are a math statement of what the given is (Perimeter, area).
    The rest is algebra, you can do that however you see fit. DrWLS did it by substitution.

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