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10 Jun 2016, 01:38
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D
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Difficulty:
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Question Stats:
89% (01:17) correct
11%
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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
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Bunuel
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
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
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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.
