AlgebraHardPredicting from a linear trend
Algebra practice question
A queue for a ride had 60 people at 10 a.m. and 96 people at 1 p.m., growing at a constant rate. If the rate continues, how many people will be in the queue at 4 p.m.?
- A. 132Correct
- B. 120
- C. 156
- D. 108
Answer: A. 132
Rate: 36 people over 3 hours is 12 per hour. From 60 at 10 a.m., six hours later: 60 + 72 = 132.
Why the other answers are wrong
- B. 120
- 120 uses 5 hours instead of 6.
- C. 156
- 156 uses 8 hours.
- D. 108
- 108 is the queue at 2 p.m.
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