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by jayanti » Thu Jul 21, 2011 6:25 am
the temperature in degrees Celsius (C) can be converted to temperature in degrees Fahrenheit(F)by a formula F= 9/5(C)+32. What is the temp at which F = C??

a) 20m

b) (32/5) degree

c) om

d) ''20m

e) ''40m
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by vineeshp » Thu Jul 21, 2011 6:31 am
Since F= C substitute F for C in the equation.

F = (9/5)F + 32

4/5 F = -32

F = -32 * 5/4 = -40.
Vineesh,
Just telling you what I know and think. I am not the expert. :)
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by jayanti » Thu Jul 21, 2011 6:41 am
I missed that very simple thing.....:(
Thanks
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by GMATGuruNY » Thu Jul 21, 2011 7:01 am
jayanti wrote:the temperature in degrees Celsius (C) can be converted to temperature in degrees Fahrenheit(F)by a formula F= 9/5(C)+32. What is the temp at which F = C??

a) 20 degrees

b) (32/5) degrees

c) 0 degrees

d) -20 degrees

e) -40 degrees
We can plug in the answers, which represent the temperature in degrees Celsius.

The formula indicates that F is 32 more than almost double the value of C.
Thus, unless C is negative, the value of F will be bigger than the value of C.
Eliminate A, B and C.

Answer choice D: -20 degrees Celsius
F = (9/5)(-20) + 32
F = -4.
-4 ≠ -20.
Eliminate D.

The correct answer is E.
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by jayanti » Fri Jul 22, 2011 9:04 am
hey but the correct answer is -40.
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by krishnasty » Fri Jul 22, 2011 9:19 am
IMO E

time : 2 secs
reason: i remembered it from school days dat at wich temp, F=C..;)
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