ISEE Mathematics Achievement Question 170: Answer and Explanation
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Question: 170
10. At 4:00 A.M. on a winter morning the temperature was −11°F. Every hour after that the temperature rose by 3°F. What was the temperature at 11:00 A.M.?
- A. −2°F
- B. 9°F
- C. 10°F
- D. 13°F
Correct Answer: C
Explanation:
C is correct. The length of time from 4:00 A.M. to 11:00 A.M. is 7 hours. 7 × 3 = 21, so during that time the temperature rose by 21 °F. The starting point was −11 °F, so −11 + 21 = 10 °F.