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17 Aug 2010, 09:57
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
78% (01:17) correct
22%
(01:08)
wrong
based on 176
sessions
History
Date
Time
Result
Not Attempted Yet
Of the 70 children who visited a certain doctor last week, how many had neither a cold nor a cough?
(1) 40 of the 70 children had a cold but not a cough.
(2) 20 of the 70 children had both a cold and a cough.
(1) 40 of the 70 children had a cold but not a cough.
(2) 20 of the 70 children had both a cold and a cough.
17 Aug 2010, 10:23
Kudos
Bookmarks
aiming4mba
All={Children with a cough ONLY}+{Children with a cold ONLY}+{Children with a cough AND a cold}+{Children with neither a cold nor a cough} --> 70={Children with a cough ONLY}+{Children with a cold ONLY}+{Children with a cough AND a cold}+{Children with neither a cold nor a cough}
(1) 40 of the 70 children had a cold but not a cough --> so {Children with a cold ONLY}=40. Not sufficient.
(2) 20 of the 70 children had both a cold and a cough --> so {Children with a cough AND a cold}=20. Not sufficient.
(1)+(2) 70={Children with a cough ONLY}+40+20+{Children with neither a cold nor a cough} --> 10={Children with a cough ONLY}+{Children with neither a cold nor a cough}, still 2 unknowns. Not sufficient.
Answer: E.
17 Aug 2010, 11:17
Kudos
Bookmarks
great explanation bunuel. thanks!
