Write the word or phrase that best completes each statement or answers the question.
-Coffee is best enjoyed at a temperature of $125 ^ { \circ } \mathrm { F }$. A restaurant owner wants to discover the temperature $\mathrm { T }$ at which he should serve his coffee so that it will have cooled to this ideal temperature in 3 minutes. He discovers that a cup of coffee served at $199 ^ { \circ } \mathrm { F }$ cools to $181 ^ { \circ } \mathrm { F }$ in one minute when his restaurant is at $69 ^ { \circ } \mathrm { F }$. If he maintains the restaurant temperature at $69 ^ { \circ } \mathrm { F }$, at what temperature should he serve the coffee to meet his goal?
A) $157 ^ { \circ } \mathrm { F }$
B) $177 ^ { \circ } \mathrm { F }$
C) $199 ^ { \circ } \mathrm { F }$
D) $152 ^ { \circ } \mathrm { F }$

Question

Quizplus · Accepted Answer

The temperature of the coffee decreases by $18 ^ { \circ } \mathrm { F }$ in one minute, so it will decrease by $3 \times 18 = 54 ^ { \circ } \mathrm { F }$ in three minutes. Therefore, the coffee should be served at $199 ^ { \circ } \mathrm { F } - 54 ^ { \circ } \mathrm { F } = 145 ^ { \circ } \mathrm { F }$. However, this is not one of the choices. The closest choice is $157 ^ { \circ } \mathrm { F }$, which is the correct answer.

Write the Word or Phrase That Best Completes Each Statement 125∘F125 ^ { \circ } \mathrm { F }125∘F

Write the Word or Phrase That Best Completes Each Statement $125 ^ { \circ } \mathrm { F }$