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10 Jun 2016, 01:38
Kudos
Bookmarks
D
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:
88% (01:16) correct
12%
(01:23)
wrong
based on 106
sessions
History
Date
Time
Result
Not Attempted Yet
In a school with 5 classes, each class has 2 students less then the previous class. How many students are there in the largest class if the total number of students at school is 95?
A. 17
B. 19
C. 21
D. 23
E. 25
A. 17
B. 19
C. 21
D. 23
E. 25
10 Jun 2016, 02:17
Kudos
Bookmarks
Bunuel
Total classes = 5
Total students = 95.
Average = 19
If the classes had average number of students: 19 19 19 19 19
Given case = 23 21 19 17 15
Hence number of students in the largest class = 23
Correct Option: D
10 Jun 2016, 02:58
Kudos
Bookmarks
IMO D = 23,
Do not know if there is any mathematical formula for this sequence. I solved by following method :
SUM = A+B+C+D+E
Let L be the class with largest number of students.
95 = L+L-2+L-4+L-6+L-8
95 = 5L - 20
23 = L.
Do not know if there is any mathematical formula for this sequence. I solved by following method :
SUM = A+B+C+D+E
Let L be the class with largest number of students.
95 = L+L-2+L-4+L-6+L-8
95 = 5L - 20
23 = L.
