A cup of boiling water (212∘F212^\circ F) is placed to cool in a room whose temperature remains constant at 68∘F68^\circ F. Suppose the difference between the water temperature and the room temperature is halved every 55 minutes. What is the water temperature, in degrees Fahrenheit, after 1515 minutes?
A. 77
B. 86
C. 92
D. 98
E. 104

Fraction and percentage word problems中文
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B. 86

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