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# Last year all refuse collected by Shelbyville city services

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Last year all refuse collected by Shelbyville city services [#permalink]

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19 Sep 2004, 04:52
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Last year all refuse collected by Shelbyville city services was incinerated. This incineration generated a large quantity of residual ash. In order to reduce the amount of residual ash Shelbyville generates this year to half of last year's total, the city has revamped its collection program. This year city services will separate for recycling enough refuse to reduce the number of truckloads of refuse to be incinerated to half of last year's number.

Which of the following is required for the revamped collection program to achieve its aim?

(A) This year, no materials that city services could separate for recycling will be incinerated.
(B) Separating recyclable materials from materials to be incinerated will cost Shelbyville less than half what it cost last year to dispose of the residual ash.
(C) Refuse collected by city services will contain a larger proportion of recyclable materials this year than it did last year.
(D) The refuse incinerated this year will generate no more residual ash per truckload incinerated than did the refuse incinerated last year.
(E) The total quantity of refuse collected by Shelbyville city service's this year will be no greater than that collected last year.

Last edited by Engr2012 on 02 Aug 2015, 10:40, edited 3 times in total.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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27 Jan 2006, 22:17
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A point which I want to add is that for such questions you always need to compare like for like.

For eg: in this question reducing the ash by half necessarily does not mean reducing the no. of truck loads. It would be wrong to assume that 1/2 truckload = 1/2 ash
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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19 Aug 2009, 15:40
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Last year all refuse collected by Shelbyville city /services was incinerated. This incineration generated a large quantity of residual ash. In order to reduce the amount of residual ash Shelbyville generates this year to half of last year's total, the city has revamped its collection program. This year city services will separate for recycling enough refuse to reduce the number of truckloads of refuse to be incinerated to half of last year's number.

Which of the following is required for the revamped collection program to achieve its aim?

(A) This year, no materials that city services could separate for recycling will be incinerated.
(B) Separating recyclable materials from materials to be incinerated will cost Shelbyville less than half what it cost last year to dispose of the residual ash.
(C) Refuse collected by city services will contain a larger proportion of recyclable materials this year than it did last year.
(D) The refuse incinerated this year will generate no more residual ash per truckload incinerated than did the refuse incinerated last year.
(E) The total quantity of refuse collected by Shelbyville city service's this year will be no greater than that collected last year.

Please explain in a detailed reasoning.Nice explanation will be appreciated with kudos ) . OA after explanations.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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19 Aug 2009, 16:21
perfectstranger wrote:
Last year all refuse collected by Shelbyville city /services was incinerated. This incineration generated a large quantity of residual ash. In order to reduce the amount of residual ash Shelbyville generates this year to half of last year's total, the city has revamped its collection program. This year city services will separate for recycling enough refuse to reduce the number of truckloads of refuse to be incinerated to half of last year's number.

Which of the following is required for the revamped collection program to achieve its aim?

(A) This year, no materials that city services could separate for recycling will be incinerated.
(B) Separating recyclable materials from materials to be incinerated will cost Shelbyville less than half what it cost last year to dispose of the residual ash.
(C) Refuse collected by city services will contain a larger proportion of recyclable materials this year than it did last year.
(D) The refuse incinerated this year will generate no more residual ash per truckload incinerated than did the refuse incinerated last year.
(E) The total quantity of refuse collected by Shelbyville city service's this year will be no greater than that collected last year.

Please explain in a detailed reasoning.Nice explanation will be appreciated with kudos ) . OA after explanations.

The premise of the argument is that Shelbyville wants to reduce the amount of ash to 1/2 so it is revamping the system. We are looking for a way to achieve the aim.

The best way to do such questions is to try to disprove the statement and see if argument holds.

I will get down to the answer which is D. If the city increases the ash per truckload, then the city will not be able to achieve its goals. If number of truckloads is reduced but the quantity is increased, then nothing has theoretically changed.

D
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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20 Aug 2009, 00:23
The ash quantity generated should be comparable a.k.a equal for the same load. IMO D
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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20 Aug 2009, 02:52
sher676 Could you please explain why E is wrong?

OA :
[Reveal] Spoiler:
D

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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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20 Aug 2009, 05:23
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perfectstranger wrote:
sher676 Could you please explain why E is wrong?

OA :
[Reveal] Spoiler:
D

E is not an essential assumption in this question. Best way to test is to try to nullify the argument and see if the premise holds.

If the total quantity of truckload is equal to or greater than last year's, we can still have a case where refuse collected does not translate to ash. What if the the city decides not to incinerate some of the refuse and keep it. That would mean that ash has lessened but the refuse has not.
In a nutshell this argument is open to debate. Usually in questions like these go for the ones which attack the question as directly as possible.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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26 Sep 2009, 22:42
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If we choose D, what if the number of trucks goes up? Even if the amount of trash per truck remains the same, if the number increases dramatically, this will increase the amount of total ash huh?
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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27 Sep 2009, 10:10
arammug, looks like quesion is 'Which of the following is required for the revamped collection program to achieve its aim' so 'D' looks good.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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26 Oct 2009, 00:49
I love CR... even though sometimes I mess it up.. :D

Shelbyville wants to reduce its emissions of incineration by separating the recyclable material, so it is a premise that if it burns less material, it will surely reduce its emissions.

The only thing you need to ask is whether the total amount of ash disposed this year will be less than was last year.

A) good, but too extreme
B) it is not about the cost
C) good, but it does not guarantee that the final amount of disposal of this year will be less than last year's
D) my answer: it tells exactly what I said --> the final amount
E) ok, but this tells nothing about the recycling unit. Moreover, it is harder to guarantee the city's refuse output than the amount of recycled material
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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23 Dec 2009, 13:14
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Last year all refuse collected by Shelbyville city services was incinerated. This incineration generated a large
quantity of residual ash. In order to reduce the amount of residual ash Shelbyville generates this year to half of
last year’s total, the city has revamped its collection program. This year city services will separate for recycling
enough refuse to reduce the number of truckloads of refuse to be incinerated to half of last year’s number.
Which of the following is required for the revamped collection program to achieve its aim?
(A) This year, no materials that city services could separate for recycling will be incinerated.
(B) Separating recyclable materials from materials to be incinerated will cost Shelbyville less than half what it
cost last year to dispose of the residual ash.
(C) Refuse collected by city services will contain a larger proportion of recyclable materials this year than it
did last year.
(D) The refuse incinerated this year will generate no more residual ash per truckload incinerated than did the
refuse incinerated last year.
(E) The total quantity of refuse collected by Shelbyville city services this year will be no greater than that
collected last year.

[Reveal] Spoiler:
D
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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23 Dec 2009, 22:58
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ISBtarget wrote:
(A) This year, no materials that city services could separate for recycling will be incinerated.
(B) Separating recyclable materials from materials to be incinerated will cost Shelbyville less than half what it
cost last year to dispose of the residual ash. cost out of scope
(C) Refuse collected by city services will contain a larger proportion of recyclable materials this year than it
(D) The refuse incinerated this year will generate no more residual ash per truckload incinerated than did the
refuse incinerated last year. Ok. The program is to halve the number of trucks of refuse to be incinerated. Target is to halve the amount of ash. So, we have:
Last year (no of tracks)*(amount of ash per truck) = (total ash).
This year 1/2(no of trucks)*(amount of ash per truck) = 1/2(total ash)
Clearly, in order it to be true, amount of ash per truck have to remain, what D says

(E) The total quantity of refuse collected by Shelbyville city services this year will be no greater than that
collected last year. Looks tempting. But in fact it does not matter how many refuse is collected this year. The program is to halve the number of trucks of refuse to be incinerated. For example: Last year Total refuse = 100 kg, number of trucks = 10; This year: Total refuse = 200 kg, but the number of trucks = 5, other refuse goes to recycling.

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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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24 Dec 2009, 21:40
all refuse was incinerated. Generated large quantity of residual ash.
revamped the collection program in order to reduce the ash to half.
Number of truckloads to be incinerated be half of last year. by recylcing enough

to achieve this aim it is necessary to ensure that refuse incinerated this year will generate no more residual ash per truckload than did refuse incinerated last year. Thus D
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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24 Dec 2009, 22:00
I chose C even though my instincts told me D. C seemed to make sense. I think I nixed D because the goal of the program was to cut residual ash in half. It's late; I look at it again tomorrow.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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22 Sep 2010, 09:04
I went with D since it said truck load is reduced and D says same truck load will not produce more ash..so effect is - less ash as desired
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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12 Apr 2011, 11:50
Answer E is a deception in case you are in hurry.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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28 Apr 2011, 06:31
"D" . It took me 3 mintues 40 second to answer the qeustion. I had to break the statement in two parts. First statement "large
quantity of residual ash" and In order to reduce the amount of ash the city has revamped its collection program reducing the number of truckloads.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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24 May 2011, 22:30
D gives clean reason that if the residual ash per truckload increases then it will be a problem.

D it is.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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03 Sep 2011, 02:02
Last year all refuse collected by Shelbyville city /services was incinerated. This incineration generated a large quantity of residual ash. In order to reduce the amount of residual ash Shelbyville generates this year to half of last year's total, the city has revamped its collection program. This year city services will separate for recycling enough refuse to reduce the number of truckloads of refuse to be incinerated to half of last year's number.

Which of the following is required for the revamped collection program to achieve its aim?

(A) This year, no materials that city services could separate for recycling will be incinerated.
(B) Separating recyclable materials from materials to be incinerated will cost Shelbyville less than half what it cost last year to dispose of the residual ash.
(C) Refuse collected by city services will contain a larger proportion of recyclable materials this year than it did last year.
(D) The refuse incinerated this year will generate no more residual ash per truckload incinerated than did the refuse incinerated last year.
(E) The total quantity of refuse collected by Shelbyville city service's this year will be no greater than that collected last year.

IMO b.
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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16 Nov 2011, 06:11
OptimusPrimea1 wrote:
Which question type is this?? Is this a find an assumption question or evaluate the argument type question?

The question stem wording is a little bit different in this case.

This is an assumption question
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Re: Last year all refuse collected by Shelbyville city services [#permalink]

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27 Dec 2011, 22:24
Clear D. The cost factor in B, IMO, is a trap because cost is not mentioned at all in the argument.
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Re: Last year all refuse collected by Shelbyville city services   [#permalink] 27 Dec 2011, 22:24

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