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A photocopier can copy r pages per hour. How many pages can
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08 Dec 2017, 20:35
08 Dec 2017, 20:35
Expert Reply
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Question Stats:
96% (00:42) correct
4% (00:00) wrong based on 25 sessions
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A photocopier can copy r pages per hour. How many pages can it copy in s seconds?
A. \(\frac{rs}{60}\)
B. \(\frac{r}{60s}\)
C. \(\frac{s}{3600r}\)
D. \(\frac{rs}{3600}\)
E. \(3600rs\)
A. \(\frac{rs}{60}\)
B. \(\frac{r}{60s}\)
C. \(\frac{s}{3600r}\)
D. \(\frac{rs}{3600}\)
E. \(3600rs\)
Drill 2
Question: 9
Page: 526
Question: 9
Page: 526
Re: A photocopier can copy r pages per hour. How many pages can
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08 Dec 2017, 22:35
08 Dec 2017, 22:35
We can assign nice values here. 720 copies per hour, per minute it will be 12 pages and lets say that in 30 seconds we have 6 copies.
We just plug the values and answer D leads to our 6.
We just plug the values and answer D leads to our 6.
Re: A photocopier can copy r pages per hour. How many pages can
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29 Dec 2017, 14:05
29 Dec 2017, 14:05
Expert Reply
Explanation
Try plugging in a number for s that divides easily by 60, such as 7,200. So, if s = 7,200 seconds, that’s 120 minutes or 2 hours. Plug in a nice number for r such as 5.
So, if the copier makes 5 pages per hour for 2 hours, your target is 10 pages.
Plug s = 7,200 and r = 5 into the answers. Ballpark: Choice (A) is too large, choice (B) too small, choice (C) too small, and choice (E) far too large. Only choice (D) yields your target of 10.
Hence option D is correct!
Try plugging in a number for s that divides easily by 60, such as 7,200. So, if s = 7,200 seconds, that’s 120 minutes or 2 hours. Plug in a nice number for r such as 5.
So, if the copier makes 5 pages per hour for 2 hours, your target is 10 pages.
Plug s = 7,200 and r = 5 into the answers. Ballpark: Choice (A) is too large, choice (B) too small, choice (C) too small, and choice (E) far too large. Only choice (D) yields your target of 10.
Hence option D is correct!
