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A new water pump was fixed in a locality of 1200 people. They were ask

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Joined: 15 Dec 2015
Posts: 120
GMAT 1: 660 Q46 V35
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WE: Information Technology (Computer Software)
A new water pump was fixed in a locality of 1200 people. They were ask [#permalink]

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New post 04 Feb 2018, 11:51
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  45% (medium)

Question Stats:

80% (03:39) correct 20% (02:45) wrong based on 15 sessions

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A new water pump was fixed in a locality of 1200 people. They were asked to give ratings to the purity of new water supply and the old one. The feedback is shown in the table below, more number of stars means better the quality.

If 3 or 2 star rating implies dissatisfaction and 275 people, who gave 5 star rating to old water supply, disliked the new one, how many did not like any of the two?

(A) 225
(B) 250
(C) 500
(D) 550
(E) 650

[Reveal] Spoiler:
Attachment:
2018-02-05 01_17_10-Microsoft Office 2010.png
2018-02-05 01_17_10-Microsoft Office 2010.png [ 334.95 KiB | Viewed 414 times ]
[Reveal] Spoiler: OA
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Joined: 02 Aug 2009
Posts: 5647
Re: A new water pump was fixed in a locality of 1200 people. They were ask [#permalink]

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New post 04 Feb 2018, 18:26
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DHAR wrote:
Image
A new water pump was fixed in a locality of 1200 people. They were asked to give ratings to the purity of new water supply and the old one. The feedback is shown in the table below, more number of stars means better the quality.

If 3 or 2 star rating implies dissatisfaction and 275 people, who gave 5 star rating to old water supply, disliked the new one, how many did not like any of the two?

(A) 225
(B) 250
(C) 500
(D) 550
(E) 650

[Reveal] Spoiler:
Attachment:
2018-02-05 01_17_10-Microsoft Office 2010.png


More likely to be an IR question..
we have 275 out of 450 who gave 5-star rating to only OLD ..
so the dissatisfied customers of new will contain this 275..
so number of people dissatisfied with both = number of dissatisfied with new - 275 = 225+600-275=550

D
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html


BANGALORE/-

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Joined: 27 Jun 2015
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Re: A new water pump was fixed in a locality of 1200 people. They were ask [#permalink]

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New post 05 Feb 2018, 18:49
chetan2u wrote:
DHAR wrote:
Image
A new water pump was fixed in a locality of 1200 people. They were asked to give ratings to the purity of new water supply and the old one. The feedback is shown in the table below, more number of stars means better the quality.

If 3 or 2 star rating implies dissatisfaction and 275 people, who gave 5 star rating to old water supply, disliked the new one, how many did not like any of the two?

(A) 225
(B) 250
(C) 500
(D) 550
(E) 650

[Reveal] Spoiler:
Attachment:
2018-02-05 01_17_10-Microsoft Office 2010.png


More likely to be an IR question..
we have 275 out of 450 who gave 5-star rating to only OLD ..
so the dissatisfied customers of new will contain this 275..
so number of people dissatisfied with both = number of dissatisfied with new - 275 = 225+600-275=550

D


Hi chetan2u,
Thanks for the explanation.
But I can't get around the logic here. No. of dissatisfied with new = 825.
275 cust have given 5-star to only Old, so 275 are dissatisfied with new.
So,how do we know there are customers in '825', who dislike Old?
Also, can you please tell why we are subtracting 275 from 825; how do we know there is redundancy of 275 in 825?
Expert Post
1 KUDOS received
Math Expert
User avatar
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Joined: 02 Aug 2009
Posts: 5647
A new water pump was fixed in a locality of 1200 people. They were ask [#permalink]

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New post 05 Feb 2018, 19:03
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KUDOS
Expert's post
kkrrsshh wrote:
chetan2u wrote:
DHAR wrote:
Image
A new water pump was fixed in a locality of 1200 people. They were asked to give ratings to the purity of new water supply and the old one. The feedback is shown in the table below, more number of stars means better the quality.

If 3 or 2 star rating implies dissatisfaction and 275 people, who gave 5 star rating to old water supply, disliked the new one, how many did not like any of the two?

(A) 225
(B) 250
(C) 500
(D) 550
(E) 650

[Reveal] Spoiler:
Attachment:
2018-02-05 01_17_10-Microsoft Office 2010.png


More likely to be an IR question..
we have 275 out of 450 who gave 5-star rating to only OLD ..
so the dissatisfied customers of new will contain this 275..
so number of people dissatisfied with both = number of dissatisfied with new - 275 = 225+600-275=550

D


Hi chetan2u,
Thanks for the explanation.
But I can't get around the logic here. No. of dissatisfied with new = 825.
275 cust have given 5-star to only Old, so 275 are dissatisfied with new.
So,how do we know there are customers in '825', who dislike Old?
Also, can you please tell why we are subtracting 275 from 825; how do we know there is redundancy of 275 in 825?


Another way

It is given OLD-
Dissatisfied-50+700=750 ; satisfied-450; Total-1200

NEW-
Dissatisfied-225+600-825; satisfied-375; Total-1200

Now it is given 275 who were satisfied with Old are not satisfied with new.
So 450-275=175 are satisfied with both..
These 175 are in new satisfied also, so those only satisfied with new = 375-175=200..

Total satisfied with atleast 1= \(200+175+275=650..\)
Therefore those not satisfied with any = \(1200-650=550\)..
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html


BANGALORE/-

A new water pump was fixed in a locality of 1200 people. They were ask   [#permalink] 05 Feb 2018, 19:03
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