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# The temperature of a certain cup of coffee 10 minutes after

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SVP
Joined: 14 Dec 2004
Posts: 1689
The temperature of a certain cup of coffee 10 minutes after [#permalink]

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24 Apr 2006, 06:38
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Question Stats:

100% (02:21) correct 0% (00:00) wrong based on 6 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
Intern
Joined: 02 Mar 2006
Posts: 21

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24 Apr 2006, 06:45
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
Manager
Joined: 20 Nov 2004
Posts: 108

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24 Apr 2006, 07:09
klsrikanth is right. Same explanation, same answer -> B.
SVP
Joined: 14 Dec 2004
Posts: 1689

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24 Apr 2006, 10:27
The OA is "B", it's pretty different kind of question, though simple one.
24 Apr 2006, 10:27
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