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In a certain formula, p is directly proportional to s and

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In a certain formula, p is directly proportional to s and [#permalink] New post 06 Aug 2003, 08:54
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In a certain formula, p is directly proportional to s and inversely proportional to r. If p=1 when r=.5 and s=2, what is the value of p in terms of r and s?

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 [#permalink] New post 06 Aug 2003, 10:13
Individually,

P=s/2 and P=1/2r

If combined, P^2 = s/4r
=> P=+1/2 * sqrt(s/r) or P=+1/2 * sqrt(s/r)

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 [#permalink] New post 09 Aug 2003, 16:00
I read this problem a bit differently:

p=X*(s/r); if p=1, s=2, and r=0.5

then 1=X*(2/0.5), so X=1/4

Answer: p=1/4*(s/r)

Curly, please post the choices.
  [#permalink] 09 Aug 2003, 16:00
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