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12 Feb 2012, 10:33
Kudos
Bookmarks
C
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:
65% (01:17) correct
35%
(01:28)
wrong
based on 135
sessions
History
Date
Time
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Not Attempted Yet
When 200 laboratory rats were given an experimental medicine, some developed a skin rash and some developed sluggishness. How many of the laboratory rats developed sluggishness but not a skin rash?
(1) 175 laboratory rats developed neither sluggishness nor a skin rash.
(2) 15 laboratory rats developed a skin rash.
(1) 175 laboratory rats developed neither sluggishness nor a skin rash.
(2) 15 laboratory rats developed a skin rash.
12 Feb 2012, 10:58
Kudos
Bookmarks
Answer is C.
Statement 1: Not sufficient. Only know how many didn't have symptoms.
Statement 2: Not sufficient. Only know the amount of rats with rash.
Total = 100 = Only rash + only sluggishness + Neither + Both.
Total = 100 = [15 - X (Only rash)] + S (only sluggishness) + X (Both) + 175 (Neither)
Only Sluggishness = 15
Statement 1: Not sufficient. Only know how many didn't have symptoms.
Statement 2: Not sufficient. Only know the amount of rats with rash.
Total = 100 = Only rash + only sluggishness + Neither + Both.
Total = 100 = [15 - X (Only rash)] + S (only sluggishness) + X (Both) + 175 (Neither)
Only Sluggishness = 15
15 Feb 2012, 05:08
Kudos
Bookmarks
kys123
A & B Alone are clearly not sufficient.
Using the formula:
Total = Rash+sluggishness+Neither-Both
200 = 15 + S + 175 - Both
Since we dont know the "both" , together A & B are also insufficient.
Answer is E.
