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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
61% (02:00) correct
39%
(02:21)
wrong
based on 383
sessions
History
Date
Time
Result
Not Attempted Yet
Attachment:
Topics.png [ 3.78 KiB | Viewed 8507 times ]
(1) The number of students who did not respond “For” for either Topic was 40.
(2) The number of students who responded “Against” for both Topics was 20.
06 Dec 2012, 06:06
Kudos
Bookmarks
The table attached shows the result of survey of 100 students who responded with “For” or “Against” or “Not sure” when asked about the Debate choice of the Topic A and Topic B. What was the number of students who responded “For” for both Topics?
{Total # of students who responded "For"} = {"For" A} + {"For" B} - {"For" both};
{Total # of students who responded "For"} = 30 + 40 - {"For" both}
{"For" both} = 70 - {Total # of students who responded "For"}.
(1) The number of students who did not respond “For” for either Topic was 40 --> since 40 students did NOT respond "For", then the remaining 60 students DID respond "For" for either Topic, thus {Total # of students who responded "For"} = 60. Therefore, {"For" both} = 70 - 60 = 10. Sufficient.
(2) The number of students who responded “Against” for both Topics was 20. Not sufficient.
Answer: A.
06 Dec 2012, 07:26
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Bunuel
Bunuel but the first statement could be solved by the unknown multiplier and a ratio strategy ?? I came to A with this logic or is wrong ??
Thanks
