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09 Dec 2019, 01:22
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
42% (02:35) correct
58%
(02:50)
wrong
based on 137
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In an examination hall, all students of two different classes A & B were sitting with at least one student of each class. Each student of class A gave 3 exams and each student of class B gave 4 exams. If the number of students in class A was less than the number of students in class B, what was the number of class A students in the hall?
(1) The total number of exams taken by all students put together was 40.
(2) If 5 students from class B leave the hall, the total number of exams will be reduced to 20.
Are You Up For the Challenge: 700 Level Questions
(1) The total number of exams taken by all students put together was 40.
(2) If 5 students from class B leave the hall, the total number of exams will be reduced to 20.
Are You Up For the Challenge: 700 Level Questions
09 Dec 2019, 04:28
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#1
The total number of exams taken by all students put together was 40
3x+4y=40
x=4,y=7
x=8;y=4
x=12;y=1
If the number of students in class A was less than the number of students in class B
x<y
sufficient x=4
#2
If 5 students from class B leave the hall, the total number of exams will be reduced to 20.
x+y-5=20
x+y=25
insufficient
IMO A
The total number of exams taken by all students put together was 40
3x+4y=40
x=4,y=7
x=8;y=4
x=12;y=1
If the number of students in class A was less than the number of students in class B
x<y
sufficient x=4
#2
If 5 students from class B leave the hall, the total number of exams will be reduced to 20.
x+y-5=20
x+y=25
insufficient
IMO A
Bunuel
Ansh777
Joined: 03 Nov 2019
Last visit: 06 Jun 2023
Posts: 53
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Location: India
Schools: Booth '24 Columbia CBS '24 Darden '24 Fuqua '24 Haas '24 Harvard '24 LBS '24 Stanford '24 Kellogg '24 Wharton '24
GMAT 1: 710 Q50 V36
Schools: Booth '24 Columbia CBS '24 Darden '24 Fuqua '24 Haas '24 Harvard '24 LBS '24 Stanford '24 Kellogg '24 Wharton '24
GMAT 1: 710 Q50 V36
Posts: 53
23 Dec 2019, 06:10
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Let No of students in class A = A
Let No of students in class B = B
Answer: D
( Refer attachment for detail explanation)
Let No of students in class B = B
Answer: D
( Refer attachment for detail explanation)
Bunuel
Attachments
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