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Post new topic   Reply to topic    4GMAT - Online GMAT Preparation Forum Index -> GMAT Problem Solving
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grkmurthy
Senior Consultant


Joined: 14 Oct 2007
Posts: 37
PostPosted: Sun Jan 13, 2008 4:01 pm    Post subject: Algebra Reply with quote
The Celsius and Fahrenheit measures of temperature are related by the formula F = (9C/5) + 32. At what temperature is C = F?

(1) -40 deg
(2) -20 deg
(3) 0 deg
(4) 32 deg
(5) 20 deg
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ksvickram
Senior Consultant


Joined: 02 Jan 2008
Posts: 29
PostPosted: Mon Jan 14, 2008 1:00 pm    Post subject: Reply with quote
The answer is 1 , -40 deg.

F = 1.8 * C + 30
=> C = 1.8 * C + 32 (Since C = F)
=> 0.8 C = -32
=> C = -40 deg.
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