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According to a survey, 7 percent of teenagers have not used a computer
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10 Jan 2024, 00:15
10 Jan 2024, 00:15
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80% (03:19) correct
20% (01:10) wrong based on 5 sessions
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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%
(A) 13%
(B) 56%
(C) 77%
(D) 87%
(E) 91%
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Re: According to a survey, 7 percent of teenagers have not used a computer
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19 Jan 2024, 15:48
19 Jan 2024, 15:48
1
11 percent have not used a computer to write reports, so 100-11=89 percent have used a computer to write reports.
95 percent have used a computer for one purpose, so 100-95=5 percent have not played games AND not written reports.
7 percent have not used a computer to play games, so 7-5=2 percent have not played games AND have written reports.
This leaves us with 89-2=87 percent who have used a computer to play games AND to write reports.
95 percent have used a computer for one purpose, so 100-95=5 percent have not played games AND not written reports.
7 percent have not used a computer to play games, so 7-5=2 percent have not played games AND have written reports.
This leaves us with 89-2=87 percent who have used a computer to play games AND to write reports.
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File comment: Matrix of students
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matrix_of_students.png [ 22.3 KiB | Viewed 417 times ]
gmatclubot
Re: According to a survey, 7 percent of teenagers have not used a computer [#permalink]
19 Jan 2024, 15:48
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