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10 Feb 2020, 23:11
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
93% (01:40) correct
7%
(01:54)
wrong
based on 54
sessions
History
Date
Time
Result
Not Attempted Yet
A group of 25 scientists works in a research lab. The average work experience of the entire group is 12 years. The male scientists have an average work experience of 14 years. What is the average work experience of female scientists, if there are 10 females in the group?
A) 7
B) 9
C) 9.5
D) 8
E) 10.1
A) 7
B) 9
C) 9.5
D) 8
E) 10.1
17 Feb 2020, 08:29
Kudos
Bookmarks
Approach:
Given:
- Total Scientists : 25, female:10, male:15
- Avg exp (All): 12 yrs
- Avg exp (Female): assume x
- Avg exp (male): 14 yrs
Total exp: 14*15 + x*10 = 12*25
210 + 10x = 300 => x = 9
Avg exp (Female): 9 yrs
Option B
Given:
- Total Scientists : 25, female:10, male:15
- Avg exp (All): 12 yrs
- Avg exp (Female): assume x
- Avg exp (male): 14 yrs
Total exp: 14*15 + x*10 = 12*25
210 + 10x = 300 => x = 9
Avg exp (Female): 9 yrs
Option B
Archit3110
Major Poster
17 Feb 2020, 11:47
Kudos
Bookmarks
Raxit85
total age of all ; 25*12 ; 300
total male ; 25-10 ; 15
and their sum of ages ; 15*14 ; 210
women sum of age ; 300-210 ; 90
and avg ; 90/10 ; 9
IMO B
