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Need help solving ... PS questions

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Need help solving ... PS questions [#permalink] New post 02 Nov 2009, 07:18
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Can someone explain how to solve this?

A rectangular circuit board is designed to have a width W inches, perimeter P inches, and area K inches. Which of the following equations must be true?

a) w2 + pw + k = 0
b) w2 - pw = 2k = 0
c) 2w2 + pw - 2k = 0
d) 2w2 - pw + 2k = 0
e) 2w2 - pw + 2k = 0

(note w2 is W squared)
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Re: Need help solving ... DS questions [#permalink] New post 02 Nov 2009, 10:37
assume l to be length. Then area k = l*w and perimeter p = 2(l+w)
substitute in equation to solve
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Re: Need help solving ... PS questions [#permalink] New post 02 Nov 2009, 13:15
Expert's post
This is a PS question posted in the wrong forum (Not DS as subject originally indicated).
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Re: Need help solving ... PS questions [#permalink] New post 02 Nov 2009, 22:19
seluka wrote:
Can someone explain how to solve this?

A rectangular circuit board is designed to have a width W inches, perimeter P inches, and area K inches. Which of the following equations must be true?

a) w2 + pw + k = 0
b) w2 - pw = 2k = 0 hope = is +
c) 2w2 + pw - 2k = 0
d) 2w2 - pw + 2k = 0
e) 2w2 - pw + 2k = 0

(note w2 is W squared)


p = 2(l+w)
l = (p-2w)/2
l = k/w
(p-2w)/2 = k/w
w(p-2w) = 2k
pw - 2w^2 - 2k = 0
2w^2 -pw + 2k = 0

B is unclear and incomplete.
D and E are same??
A is never possible.

Chose between D and E.
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Re: Need help solving ... PS questions   [#permalink] 02 Nov 2009, 22:19
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