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# A photocopier can copy r pages per hour. How many pages can

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GRE Prep Club Legend
Joined: 07 Jun 2014
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A photocopier can copy r pages per hour. How many pages can [#permalink]  08 Dec 2017, 20:35
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00:00

Question Stats:

100% (00:25) correct 0% (00:00) wrong based on 3 sessions
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. $$3600rs$$

Drill 2
Question: 9
Page: 526

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Manager
Joined: 25 Nov 2017
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Kudos [?]: 41 [0], given: 5

Re: A photocopier can copy r pages per hour. How many pages can [#permalink]  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.
GRE Prep Club Legend
Joined: 07 Jun 2014
Posts: 4856
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 102

Kudos [?]: 1734 [0], given: 397

Re: A photocopier can copy r pages per hour. How many pages can [#permalink]  29 Dec 2017, 14:05
Expert's post
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!
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Sandy
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Re: A photocopier can copy r pages per hour. How many pages can   [#permalink] 29 Dec 2017, 14:05
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