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27 Feb 2019, 23:15
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
78% (02:13) correct
22%
(02:22)
wrong
based on 110
sessions
History
Date
Time
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Not Attempted Yet
All but 4 of the counselors on staff at a certain summer camp have sailing certification, first aid certification, or both. Twice as many counselors have neither certification as have both certifications, and 7 counselors have sailing certification. If there are a total of 22 counselors on staff, then how many of the counselors have first aid certification?
A. 9
B. 13
C. 15
D. 22
E. 23
A. 9
B. 13
C. 15
D. 22
E. 23
Archit3110
Major Poster
28 Feb 2019, 03:53
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Bunuel
given total counselors 22
neither is 4
One or both certification = 22-4=18
given ; Twice as many counselors have neither certification as have both certifications; 4/2=2
only sailing certification; 7-both =7-2=5
only first aid certification = 18-5=13
IMO B
18 Mar 2019, 17:22
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Quote:
Would this not include "only french" and "both"? 13 is the number of "only french". Should C not be the answer?
