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

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Eternal Intern
Joined: 07 Jun 2003
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Location: Lone Star State
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In a certain formula, p is directly proportional to s and [#permalink]  06 Aug 2003, 07:54
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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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Ride em cowboy

Manager
Joined: 22 Jul 2003
Posts: 62
Location: CA
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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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Intern
Joined: 03 Feb 2003
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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

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