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A grain elevator moves 200 pounds of grain every 15 minutes

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A grain elevator moves 200 pounds of grain every 15 minutes [#permalink] New post 21 Jun 2017, 02:24
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60% (01:43) correct 40% (01:18) wrong based on 10 sessions


A grain elevator moves 200 pounds of grain every 15 minutes. If the elevator starts moving grain at noon, and stops some time between 3:00 p . m . to 4:00 p . m ., which of the following could be the weight, in pounds, of the grain moved by the elevator?

Indicate all such values.

❑ 800

❑ 2,400

❑ 2,732

❑ 3,000

❑ 3,200

❑ 3,600

[Reveal] Spoiler: OA
B,C,D,E
[Reveal] Spoiler: OA

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Re: A grain elevator moves 200 pounds of grain every 15 minutes [#permalink] New post 05 Jul 2017, 20:55
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Hi @Carcass


I am not able to get the answer for this one.

Here is what I did =>

15 minutes => 200 pounds => It must remove 800 pounds every hour.

Now it stopped "Between" 3 PM and 4PM so the weight removed must be between 800*3 to 800*4 => (2400,3200)
As the question says between => 2400 and 3200 are not possible either.

Hence only answer that would suffice is C.

Am I missing something ?
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Re: A grain elevator moves 200 pounds of grain every 15 minutes [#permalink] New post 07 Jul 2017, 01:43
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Hi,

in this kind of question not work upfront, but with reverse engineering, I.E. go with logic and POE.

Now we do know that the elevator moves for 3 hours, so we do have 800 pounds for 3 = 2400. So B is correct quite straight.

Now the question tells you that the elevator itself could stop at ANY minutes between 3.00 and 4.00. It could be 3.01 or 4.00, 4.01 is clearly excluded.

Working on the extremes, 3600 is not possible because is over the time we do have allotted.

Now, considering it stops at 4.00 you do have 800 extra pounds 2400+800=3200. From this, all values between 2400 and 3200 (the two extremes) ar possible, without any such calculation.

Only A and F are wrong. the others are right.

Quote:
As the question says between => 2400 and 3200 are not possible either.


No, this is not stated in the stimulus.

Hope now is clear.

regardsd
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Re: A grain elevator moves 200 pounds of grain every 15 minutes [#permalink] New post 22 Jan 2018, 21:20
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Carcass wrote:


A grain elevator moves 200 pounds of grain every 15 minutes. If the elevator starts moving grain at noon, and stops some time between 3:00 p . m . to 4:00 p . m ., which of the following could be the weight, in pounds, of the grain moved by the elevator?

Indicate all such values.

❑ 800

❑ 2,400

❑ 2,732

❑ 3,000

❑ 3,200

❑ 3,600

[Reveal] Spoiler: OA
B,C,D,E


R=D/T
Since Speed =200/15 (15 min =1/4hour), so 200/1/4=200*4=800
We can identify two extreme cases, if the elevator works 3 hours or 4 hours:
(D=RT) D=800*3=2400
D=800*4=3200
So, 2400 ≤ D ≤ 3200
Re: A grain elevator moves 200 pounds of grain every 15 minutes   [#permalink] 22 Jan 2018, 21:20
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