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Gian
Joined: 25 Apr 2012
Last visit: 21 Dec 2014
Posts: 138
Given Kudos: 69
Status:Prep Mode
Location: India
Schools: Owen '16 (S) Tippie '16 (A) Olin '16 (D) Neeley '16 (A) Fisher '16 (S) Cox '16 (A) Krannert '16 (S) Broad '16 (D) Simon '16 (A) Kelley '16 (D)
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Difficulty:
65%
(hard)
Question Stats:
52% (02:15) correct
48%
(01:43)
wrong
based on 23
sessions
History
Date
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Not Attempted Yet
The average weight of the students in a class is 48kg. What is the number of students in the class?
1) If weights of two students were 64 and 45 instead of 46 and 54, then the average would be 50kg.
2) If two more students of weights 44 and 52kg joined the class, the average would remain the same.
Not convinced with the OA.
1) If weights of two students were 64 and 45 instead of 46 and 54, then the average would be 50kg.
2) If two more students of weights 44 and 52kg joined the class, the average would remain the same.
Not convinced with the OA.
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10 Aug 2013, 05:54
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The average weight of the students in a class is 48kg. What is the number of students in the class?
1) If weights of two students were 64 and 45 instead of 46 and 54, then the average would be 50kg.
\(\frac{48n-46-54+64+45}{n}=50\) from this we get n=4.5.
This is sufficient, however this number makes no sense (you can't have 4.5 students).
2) If two more students of weights 44 and 52kg joined the class, the average would remain the same.
\(\frac{48n+44+52}{n+2}=48\), \(48n+44+52=48n+96\). This adds no info.
Not sufficient
1) If weights of two students were 64 and 45 instead of 46 and 54, then the average would be 50kg.
\(\frac{48n-46-54+64+45}{n}=50\) from this we get n=4.5.
This is sufficient, however this number makes no sense (you can't have 4.5 students).
2) If two more students of weights 44 and 52kg joined the class, the average would remain the same.
\(\frac{48n+44+52}{n+2}=48\), \(48n+44+52=48n+96\). This adds no info.
Not sufficient
Gian
Joined: 25 Apr 2012
Last visit: 21 Dec 2014
Posts: 138
Own Kudos:
Given Kudos: 69
Status:Prep Mode
Location: India
Schools: Owen '16 (S) Tippie '16 (A) Olin '16 (D) Neeley '16 (A) Fisher '16 (S) Cox '16 (A) Krannert '16 (S) Broad '16 (D) Simon '16 (A) Kelley '16 (D)
Products:
10 Aug 2013, 06:00
Kudos
Bookmarks
Thanks, just wanted to double check whether I was correct.
Btw, I loved the previous line in your signature that one only requires a library and a gf in life
Btw, I loved the previous line in your signature that one only requires a library and a gf in life
