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The temperature of a certain cup of coffee 10 minutes after

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SVP
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The temperature of a certain cup of coffee 10 minutes after [#permalink] New post 24 Apr 2006, 05:38
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A
B
C
D
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100% (02:21) correct 0% (00:00) wrong based on 4 sessions
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The temperature of a certain cup of coffee 10 minutes after it was poured was 120 degrees Fahrenheit. If the temperature "F" of the coffee "t" minutes after it was poured can be determined by the formula F = 120(2^(-at))+60, where "F" is in degrees Fahrenheit and "a" is a constant, then the temperature of the coffee 30 minutes after it was poured was how many degrees Fahrenheit.

A) 65
B) 75
C) 80
D) 85
E) 90
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 [#permalink] New post 24 Apr 2006, 05:45
Ans: B

from the ien equation substituting f=120 and t=10 we get a=1/10

Therefore if a=1/10 and t=30..... F=75
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 [#permalink] New post 24 Apr 2006, 06:09
klsrikanth is right. Same explanation, same answer -> B.
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 [#permalink] New post 24 Apr 2006, 09:27
:-D The OA is "B", it's pretty different kind of question, though simple one.
  [#permalink] 24 Apr 2006, 09:27
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The temperature of a certain cup of coffee 10 minutes after

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