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According to a survey, 7 percent of teenagers have not used a computer

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According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 03 Jul 2017, 02:32
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According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%

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According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 03 Jul 2017, 02:43
4
1
Given: 7 percent of teenagers have not used a computer to play games.

The percentage of teenagers who have used a computer to play games is 93%
Since 11 percent have not used a computer to write reports, the percentage of
teenagers who have used a computer to write reports is 89%

It has been given that teenagers who have used the computer for at least one of
the purposes - 95% (making the number of teenagers not using computers - 5%)

P(Total) = P(Play games) + P(Write Reports) - P(Both) + P(Neither)

Substituting values, we will get 100 = 93 + 89 - x + 5 | x = 182 + 5 - 100 = 87

Therefore, the percentage of teenagers who use the computer for both purposes is 87%(Option D)
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Re: According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 03 Oct 2018, 06:21
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


The best way to solve this is by forming a grid but I am solving this in different way here.

Total teenager who used computer to play games = 100-7 = 93 = a+b
where b is the students who play games as well as write report on computer
Total teenager who used computer to write reports = 100-11 = 89 = b+c

Also, a+b+c = 95
i.e. c = 95-93 = 2
i.e. b = 89-2 = 87

Answer: Option D
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According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 03 Oct 2018, 12:32
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


something didnt work out ...hmm

100 = group 1 + group 2 -(both)+neither

100 = 7+11-(95-x)+0 :?
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Re: According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 03 Oct 2018, 19:26
2
1
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


Please solution using grid as mentioned below:

Answer: Option D

funsogu Please check answer to your question (asked in PM) here. a+b+c = 95 which gives us d = 100-95=5

I hope this helps!!!
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Re: According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 03 Oct 2018, 19:30
dave13 wrote:
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


something didnt work out ...hmm

100 = group 1 + group 2 -(both)+neither

100 = 7+11-(95-x)+0 :?


Problem starts with your group1 and group 2 probably

Check the grid and see if it makes sense
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Re: According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 03 Oct 2018, 19:38
GMATinsight It helps. Thanks.


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According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 05 Oct 2018, 08:44
GMATinsight wrote:
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


The best way to solve this is by forming a grid but I am solving this in different way here.

Total teenager who used computer to play games = 100-7 = 93 = a+b
where b is the students who play games as well as write report on computer
Total teenager who used computer to write reports = 100-11 = 89 = b+c

what does C mean ?

Another question if 95 percent have used a computer for at least one of the above purposes, then it means that either student used computer only for one of purposes or used computers for both purposes, IF MY UNDERSTANDING IS CORRECT the Why are you subtracting from 100 and not from 95 ?

One more question if 95 percent have used a computer for at least one of the above purposes THEN 5% DIDNT USE COMPUTER AT ALL ?
Also, a+b+c = 95
i.e. c = 95-93 = 2
i.e. b = 89-2 = 87

Answer: Option D




hello GMATinsight: i still have questions if you dont mind :)

Total teenager who used computer to write reports = 100-11 = 89 = b+c


    what does C represent?

    Another question if 95 percent have used a computer for at least one of the above purposes, then it means that either student used computer only for one of purposes or used computers for both purposes, IF MY UNDERSTANDING IS CORRECT then Why are you subtracting from 100 and not from 95 ?


    One more question if 95 percent have used a computer for at least one of the above purposes THEN 5% DIDNT USE COMPUTER AT ALL ?
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Re: According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 05 Oct 2018, 09:07
1
1
dave13 wrote:
GMATinsight wrote:
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


The best way to solve this is by forming a grid but I am solving this in different way here.

Total teenager who used computer to play games = 100-7 = 93 = a+b
where b is the students who play games as well as write report on computer
Total teenager who used computer to write reports = 100-11 = 89 = b+c

what does C mean ?

Another question if 95 percent have used a computer for at least one of the above purposes, then it means that either student used computer only for one of purposes or used computers for both purposes, IF MY UNDERSTANDING IS CORRECT the Why are you subtracting from 100 and not from 95 ?

One more question if 95 percent have used a computer for at least one of the above purposes THEN 5% DIDNT USE COMPUTER AT ALL ?
Also, a+b+c = 95
i.e. c = 95-93 = 2
i.e. b = 89-2 = 87

Answer: Option D




hello GMATinsight: i still have questions if you dont mind :)

Total teenager who used computer to write reports = 100-11 = 89 = b+c


    what does C represent?

    Another question if 95 percent have used a computer for at least one of the above purposes, then it means that either student used computer only for one of purposes or used computers for both purposes, IF MY UNDERSTANDING IS CORRECT then Why are you subtracting from 100 and not from 95 ?


    One more question if 95 percent have used a computer for at least one of the above purposes THEN 5% DIDNT USE COMPUTER AT ALL ?


If you check the grid solution mentioned above then your doubt can be answered.

c = People who use computer for reading but nor for games

also, your understanding of 95% is correct. This number represents the people who use computer for atleast one of these activities which is why we can say that rest 5% (100-95) as shown in grid also do NOT use computer for wither of the two activities.
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Re: According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 05 Oct 2018, 09:23
1
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


hi Bunuel this question was posted here as well https://gmatclub.com/forum/according-to ... 43876.html

is it 700 or 600 level question ? :?
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Re: According to a survey, 7 percent of teenagers have not used a computer  [#permalink]

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New post 06 Oct 2018, 02:28
1
dave13 wrote:
Bunuel wrote:
According to a survey, 7 percent of teenagers have not used a computer to play games, 11 percent have not used a computer to write reports, and 95 percent have used a computer for at least one of the above purposes. What percent of the teenagers in the survey have used a computer both to play games and to write reports?

(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%


hi Bunuel this question was posted here as well https://gmatclub.com/forum/according-to ... 43876.html

is it 700 or 600 level question ? :?


Thank you, Dave. Merged the topics.

According to our stats, it's a 600-700 level question.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: According to a survey, 7 percent of teenagers have not used a computer &nbs [#permalink] 06 Oct 2018, 02:28
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