Difference between revisions of "2022 AMC 8 Problems/Problem 9"
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==Problem== | ==Problem== | ||
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| + | A cup of boiling water (<math>212^{\circ}\text{F}</math>) is placed to cool in a room whose temperature remains constant at <math>68^{\circ}\text{F}</math>. Suppose the difference between the water temperature and the room temperature is halved every <math>5</math> minutes. What is the water temperature, in degrees Fahrenheit, after <math>15</math> minutes? | ||
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| + | <math>\textbf{(A)} ~77\qquad\textbf{(B)} ~86\qquad\textbf{(C)} ~92\qquad\textbf{(D)} ~98\qquad\textbf{(E)} ~104</math> | ||
==Solution== | ==Solution== | ||
Revision as of 11:04, 28 January 2022
Problem
A cup of boiling water (
) is placed to cool in a room whose temperature remains constant at 
. Suppose the difference between the water temperature and the room temperature is halved every 
minutes. What is the water temperature, in degrees Fahrenheit, after 
minutes?
Solution
See Also
| 2022 AMC 8 (Problems • Answer Key • Resources) | ||
| Preceded by Problem 8 |
Followed by Problem 10 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AJHSME/AMC 8 Problems and Solutions | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
