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22 Jan 2019, 02:18
Kudos
Bookmarks
C
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:
95% (00:42) correct
5%
(01:33)
wrong
based on 196
sessions
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Not Attempted Yet
At Bridgewood High School, freshmen, sophomores, juniors, and seniors are in the ratio of 3:4:6:7, respectively. Which of the following CANNOT be the total number of students at the school?
A 40
B 80
C 90
D 100
E 140
A 40
B 80
C 90
D 100
E 140
Archit3110
Major Poster
22 Jan 2019, 05:48
Kudos
Bookmarks
Bunuel
total = 20
so 90 is not factor of 20
IMO c is not valid option
07 Mar 2020, 16:49
Kudos
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Bunuel
GIVEN: freshmen : sophomores : juniors : seniors = 3:4:6:7
There are infinitely-many cases that satisfy the above ratio.
For example, the school could have 3 freshmen, 4 sophomores, 6 juniors and 7 seniors for a TOTAL of 20 students
Or the school could have 6 freshmen, 8 sophomores, 12 juniors and 14 seniors for a TOTAL of 40 students
Or the school could have 9 freshmen, 12 sophomores, 18 juniors and 21 seniors for a TOTAL of 60 students
Or the school could have 12 freshmen, 16 sophomores, 24 juniors and 28 seniors for a TOTAL of 80 students
.
.
.
etc
As you can see, the TOTAL number of students is is always a multiple of 20
Check the answer choices....only answer choice C (90) is NOT a multiple of 20
Answer: C
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