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The African country of Mbotekia -- IR Two Part Analysis

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Manager
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Joined: 15 Apr 2016
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The African country of Mbotekia -- IR Two Part Analysis [#permalink]

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New post 30 Sep 2016, 01:44
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Can someone please help me solve this.
Dont know how to solve this !!

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IR_two_part_2.JPG
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Answers :
[Reveal] Spoiler:
Part-1 : C
Part-2 :J

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Cheers,
Shri
-------------------------------
GMAT is not an Exam... it is a war .. Let's Conquer !!!


Last edited by Shrivathsan on 08 Oct 2016, 20:02, edited 1 time in total.

Kudos [?]: 16 [0], given: 66

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Magoosh GMAT Instructor
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Re: The African country of Mbotekia -- IR Two Part Analysis [#permalink]

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New post 07 Oct 2016, 16:03
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Shrivathsan wrote:
Can someone please help me solve this.
Dont know how to solve this !!

Dear Shrivathsan,

I'm happy to respond. :-)

What is the source of this question? There are multiple problems with the question itself. The text contains a grammar mistake, the "due to" mistake:
"...due to the influx of refugees and the increasing population, the demand for bread has been increasing ... "
That would be wrong on GMAT SC.

Next, the prompt contains a crucial error:
...predicted that in 2016, the demand for bread will be, for the time time, greater than the supply.
I assume they mean for the "first time," but this makes the whole question garbled.

Typically, the numbers in the box would be in increasing order in a real GMAT problem.

Finally, something is funny about the answer provided.

Call the demand D and the supply S. In 2006, D = 180 and S = 540. The difference between them is 540 - 180 = 360. If the gap between them closed at exactly 36 per year, they would be equal in ten years, in 2016. The gap must close at slightly more than 36. What sum is slightly more than 36? Well, 15 + 25 is 40. The increase in D must be the larger one, so let's say D increase by 25 and S decreases by 15. In 2016, D = 180 + 250 = 430 and S = 540 - 150 = 390, so D > S in 2016. Check that this is the first time: in 2015, D = 430 - 25 = 405, and S = 390 + 15 = 405, so they would be equal. Thus, 2016 would be the first year in which D > S.
According to my calculations, we have to have:
D increase by 25
S decrease by 15
Those are answers of [C] & [J]. I don't agree at all with the answer posted.

I don't know what this source is, but if this problem is at all representative, I think you should set fire to the installation disc.

This is a poor question. Here's a set of six high quality 2PA questions:
GMAT Integrated Reasoning: Two-Part Analysis Practice Questions

Please let me know if you have any questions.
Mike :-)
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Mike McGarry
Magoosh Test Prep

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Re: The African country of Mbotekia -- IR Two Part Analysis [#permalink]

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New post 07 Oct 2016, 16:44
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Explanation:

Supply of bread in 2006 = 540 tonnes = 3 × Demand in 2006.
Thus, Demand = 540/ 3 = 180 tonnes.
Now, since 2006, supply is decreasing at some constant rate, let it be ‘x’ tonnes per year. And demand is increasing at some constant rate let it be ‘y’ tonnes per year.
Thus, in 2016 supply = 540 – 10x.
And demand = 180 + 10y.
As per prediction we know, in 2016, Demand > Supply.

(180 + 10y) > (540 – 10x)....(I)

Simplifying we get (y + x) > 36. (thus, looking at the options, we cannot take x and y both 15. As it will add up to 30 which is < 36.)

We are asked to find out x and y such that it satisfies the above condition.

Demand gets higher than supply in 2016, i.e. in 10 years. Means in 2015, Demand was not greater than supply. Thus, (180 + 9y) = (540 – 9x).....(II)

Thus, (y + x) = 40.

From the options, 25 and 15 satisfy the above two conditions.

Now, if we take y as 15 and x as 25. It does not satisfy (II)

Thus, y = 25 and x = 15.


~Consider giving Kudos if you like the solution. Be generous!
:)

Kudos [?]: 37 [2] , given: 130

Manager
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Re: The African country of Mbotekia -- IR Two Part Analysis [#permalink]

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New post 08 Oct 2016, 20:19
mikemcgarry wrote:
Those are answers of [C] & [J]. I don't agree at all with the answer posted.


Thank you so much mike :)
My bad on the OA -- The OA's are 25 and 15 indeed.

mikemcgarry wrote:
I don't know what this source is, but if this problem is at all representative, I think you should set fire to the installation disc.


Source of the question is Jamboree. Thank god, I was so worried about this question.

mikemcgarry wrote:
This is a poor question. Here's a set of six high quality 2PA questions:


Thank you so much :)
_________________

Cheers,
Shri
-------------------------------
GMAT is not an Exam... it is a war .. Let's Conquer !!!

Kudos [?]: 16 [0], given: 66

Re: The African country of Mbotekia -- IR Two Part Analysis   [#permalink] 08 Oct 2016, 20:19
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The African country of Mbotekia -- IR Two Part Analysis

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