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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 \(F=120\cdot 2^{-at}+60,\) 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
Answer: B
Source: GMAT Prep
A. 65
B. 75
C. 80
D. 85
E. 90
Answer: B
Source: GMAT Prep
