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# Traverton s city council wants to minimize the city s

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Traverton s city council wants to minimize the city s [#permalink]

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20 Jan 2010, 04:46
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Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.

Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton’s yearly maintenance costs?

(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
(B) Whether any cities have switched from incandescent lights in their traffic signals to lighting elements other than LED arrays
(C) Whether the company from which Traverton currently buys incandescent bulbs for traffic signals also sells LED arrays
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffic signals know how to convert the existing fixtures so as to accept LED arrays

OG2017 CR553 P513
[Reveal] Spoiler: OA

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Last edited by hazelnut on 16 Apr 2017, 19:44, edited 3 times in total.
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Re: Traverton s city council wants to minimize the city s [#permalink]

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31 May 2016, 21:21
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paidlukkha wrote:
Why is D wrong?
I was stuck between A & D

(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
we are evaluating but for me D looks more strong enough
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
council plans to increase the number, yearly costs wont minimize!

Comparison for Cost effecting solution is between incandescent bulbs and LED's. You got carried away by the statement "Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton"

Even if it plans to increase the number still the comparison will be between incandescent bulbs and LED's.

X number of LED are cost effective than X number of incandescent bulbs

Even if the city plans to increase the traffic lights say by a Factor of Y

Still X+ Y number of LED will be cost effective to X+Y number of incandescent bulbs. Does this all make sense to you?

Thus, D doesn't help us to reach anywhere.
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Re: Traverton s city council wants to minimize the city s [#permalink]

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20 Jan 2010, 16:04
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mojorising800 wrote:
7. Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffi c signal lights and so
is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the
incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume signifi cantly less energy
and cost no more to purchase. Moreover, the costs associated with the conversion of existing fi xtures so as to
accept LED arrays would be minimal.
Which of the following would it be most useful to know in determining whether switching to LED arrays would be
likely to help minimize Traverton’s yearly maintenance costs?
(A) Whether the expected service life of LED arrays is at least as long as that of the currently used
incandescent bulbs
(B) Whether any cities have switched from incandescent lights in their traffi c signals to lighting elements other
than LED arrays
(C) Whether the company from which Traverton currently buys incandescent bulbs for traffi c signals also sells
LED arrays
(D) Whether Traverton’s city council plans to increase the number of traffi c signal lights in Traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffi c signals know how to
convert the existing fi xtures so as to accept LED arrays
[Reveal] Spoiler:
A
]

Option A..... else reason "LED arrays consume significantly less energy and cost no more to purchase." would be nullified since LEDs would be bought and exchanged more freq than the incandescent bulbs!
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Re: Traverton s city council wants to minimize the city s [#permalink]

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20 Sep 2014, 00:51
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Re: Traverton s city council wants to minimize the city s [#permalink]

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14 Jan 2016, 13:25
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Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Traverton s city council wants to minimize the city s [#permalink]

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29 Apr 2011, 08:54
another sub-400 level question. A is blatant
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Re: Traverton s city council wants to minimize the city s [#permalink]

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30 Jan 2016, 04:05
I got this wrong.

In option A) Whether the expected service life of LED arrays is at least as long as that
of the currently used incandescent bulbs.

The para states that LEDs consume significantly less energy and cost the same.

For example

Energy savings per year caused by the change from incandescent to LED = 1000000\$
But LEDs last for 52 weeks, while incandescent last for 53 weeks.
The answer to the question, "Whether the expected service life of LED arrays is at least as long as that
of the currently used incandescent bulbs" is no here. But it would still make sense to shift from incandescent to LED, because the difference is less.

It significantly reduces energy consumption, so the only reason to not change from incandescent to LEDs would be if the service life of LEDs was significantly lesser than that of incandescent bulbs. It need not have a service life at least equal to that of incandescent.
It would be very important to know what the service lives of each of them are, so we can make a calculated decision. But the answer to the question - "Whether the expected service life of LED arrays is at least as long as that
of the currently used incandescent bulbs." tells us nothing.

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Re: Traverton s city council wants to minimize the city s [#permalink]

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08 May 2016, 00:48
Why is D wrong?
I was stuck between A & D

(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
we are evaluating but for me D looks more strong enough
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
council plans to increase the number, yearly costs wont minimize!

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Traverton s city council wants to minimize the city s [#permalink]

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16 Apr 2017, 19:42
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mojorising800 wrote:
Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.

Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton’s yearly maintenance costs?

(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
(B) Whether any cities have switched from incandescent lights in their traffic signals to lighting elements other than LED arrays
(C) Whether the company from which Traverton currently buys incandescent bulbs for traffic signals also sells LED arrays
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffic signals know how to convert the existing fixtures so as to accept LED arrays

OG2017 CR553 P513

Traverton’s Traffic Lights

Step 1: Identify the Question

The phrase most helpful to know in determining in the question stem indicates that this is an Evaluate the Argument question.

Step 2: Deconstruct the Argument

Conc: replace bulbs with LEDs to << costs
b/c…
consume < energy
no more to purchase
not costly to change

The argument provides several cost advantages associated with switching to LEDs. Are there any other potential costs not discussed?

Step 3: Pause and State the Goal

On Evaluate questions, the goal is to find a piece of information that would be important to know to determine whether the conclusion is valid.

Step 4: Work from Wrong to Right

(A) CORRECT. The life of LEDs compared to current bulbs will affect how frequently they need to be changed and thus directly influence maintenance costs. If the life is about the same or LONGER, then switching may help to minimize costs. If the life is much SHORTER, however, then switching may cause costs to increase.
(B) The decisions by other towns to use LEDs do not affect the maintenance costs in Traverton.
(C) The source for purchasing incandescent bulbs versus LEDs does not directly affect costs.
(D) The number of traffic lights does not influence the relative costs of using LEDs versus incandescent bulbs. Each light source will still need a bulb.
(E) Whether the same crew can handle LED conversion does not have a direct impact on costs. Moreover, fixture conversion represents a onetime expenditure that will not influence ongoing maintenance costs.
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Re: Traverton s city council wants to minimize the city s [#permalink]

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17 Apr 2017, 04:25
I chose D with below reasoning:
Although IB and LED arrays costs almost same, since energy consumed by LED arrays is less, this would help in minimizing T's yearly costs. If while increasing no of lights (as suggested in D), they use more LED arrays then my maintenance costs will be lower. What is incorrect with my reasoning?
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Re: Traverton s city council wants to minimize the city s [#permalink]

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17 Apr 2017, 06:00
The question asks to minimise yearly average costs. It does not ask whether the cost will increase/decrease from previous year

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Re: Traverton s city council wants to minimize the city s [#permalink]

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23 Apr 2017, 10:07
Quote:
I chose D with below reasoning:
Although IB and LED arrays costs almost same, since energy consumed by LED arrays is less, this would help in minimizing T's yearly costs. If while increasing no of lights (as suggested in D), they use more LED arrays then my maintenance costs will be lower. What is incorrect with my reasoning?

As stated by ani007garg, we are asked, "Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton’s yearly maintenance costs?" Imagine that Traverton currently has 100 traffic signal lights and each of those lights costs \$50 per year (ie cost of electricity) using incandescent bulbs (so \$5,000 total in energy costs). Switching to LEDs might reduce the annual energy cost per light bulb to \$40, bringing the total annual energy costs down to \$4,000.
Quote:
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton

Now, what if, as suggested in choice D, Traverton increases the number of traffic signal lights from, say, 100 to 200? If they stick with incandescent bulbs, the total annual energy cost will be \$10,000, but if they change to LEDs, the total annual energy cost will be \$8,000. Yes, it is true that \$8,000 is more than the original annual cost using incandescent bulbs (\$5,000), but \$8,000 is cheaper than \$10,000; therefore, based on annual energy costs, switching to LEDs would indeed help minimize Traverton's yearly maintenance costs, regardless of how many bulbs they have (or plan to have in the future). Now, if those LEDs only last half as long as the incandescent bulbs, that means Traverton will have to spend more money replacing bulbs if they convert to LEDs. This additional cost might offset the energy cost savings, in which case switching to LEDs might not help minimize Traverton's yearly maintenance costs.
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Re: Traverton s city council wants to minimize the city s   [#permalink] 23 Apr 2017, 10:07
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