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Of the 500 business people surveyed, 78 percent said that they use the

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SreeViji
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Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   Updated on: 08 Nov 2023, 03:13
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Of the 500 business people surveyed, 78 percent said that they use their laptop computers at home, 65 percent said that they use them in hotels, and 52 percent said that they use them both at home and in hotels. How many of the business people surveyed said that they do not use their laptop computers either at home or in hotels?

A. 45
B. 55
C. 65
D. 95
E. 130

PS11427

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Can somebody give the formula for this overlapping set problem?
P(AUB) = P(A)+P(B)-P(A intersection B)
I tried to use the domain matrix learnt from MGMAT. But somewhere I am going wrong, can someone help?
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A

Originally posted by SreeViji on 01 Dec 2012, 02:11.
Last edited by Bunuel on 08 Nov 2023, 03:13, edited 2 times in total.
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aemarroquin
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   23 Oct 2013, 15:40
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I kept everything in percentage form since that is how the information was presented. I did not want to introduce calculations that could lead to an error.

I used the group formula:

Total = Group 1 + Group 2 - Both + Neither.

Using the formula above and the information we are given:

100% = 78% + 65% - 52% + Neither

100% = 91% + Neither or

Neither = 100% - 91% = 9%

The total here is 500 so we can multiply 9% with 500 to get the amount of business people who do no use their laptops at home or in hotels.

(9/100) * 500 = 45

All of the methods mentioned above work, but I hope someone finds this helpful too. We can never have too many ways to approach a problem.
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   01 Dec 2012, 06:05
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SreeViji wrote:
Of the 500 business people surveyed, 78 percent said that they use their laptop computers at home, 65 percent said that they use them in hotels, and 52 percent said that they use them both at home and in hotels. How many of the business people surveyed said that they do not use their laptop computers either at home or in hotels?

A. 45
B. 55
C. 65
D. 95
E. 130

Show Spoiler
A


Can somebody give the formula for this overlapping set problem?
P(AUB) = P(A)+P(B)-P(A intersection B)
I tried to use the domain matrix learnt from MGMAT. But somewhere I am going wrong, can someone help?

I guess you made a mathematical error. Personally, I prefer creating the matrix in percentages when the question is given in percentages. And finally multiply what I want with the total. However for illustration the matrix should be
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moneymango
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   02 Dec 2012, 13:22
No reason to use formulas or weird pictures for this problem. Just think about what each set is.

I took the totals:
390 people use their laptop at home [1]
325 people use their laptop in hotels [2]
260 people use their laptop both in hotels and at home [3]

Clearly if someone uses their laptop both in hotels and at home, they belong in both the previous two sets (1,2). By subtracting set 3 from the first two, we can determine the number of people that lie in set 1 or set 2 but not in set 3.

Gives us:
130 only use their laptop at home
65 only use their laptop in hotels
260 use their laptop in both

add them up, subtract from the total and you get 45.
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   22 Oct 2013, 22:36
Refer Venn diagram below:
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   21 Nov 2015, 21:26
I used a chart like other people but left everything in percents and then calculated 9% of 500 = 45. I've found that the GMAT rewards you for procrastinating on doing calculations.
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   04 Aug 2017, 13:45
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Instead of using 500, just use 100 and then multiply the final answer by 5.

T=G1+G2-Both+Neither
100=78+65-52+X
x=9
5*9=45

Takes 30 seconds.
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   20 Feb 2021, 07:03
Expert Reply
Home + Hotels - Both = 78 + 65 - 52 = 91%

Therefore, 100% - 91% = 9% neither use it

=> \(\frac{9}{100}* 500 = 45\)

Answer A
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink] New post   13 Nov 2023, 06:56
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Re: Of the 500 business people surveyed, 78 percent said that they use the [#permalink]
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