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[GMAT math practice question]
The average weight of \(5\) students in a class was reported to be \(60kg\). However, the average seems to be too low. So after re-examination, it was found that one student was actually \(80kg\) and was recorded incorrectly. After this correction, the actual average was \(70kg\). What was the weight which was recorded incorrectly?
A. \(20kg\)
B. \(25kg\)
C. \(30kg\)
D. \(50kg\)
E. \(80kg\)
The average weight of \(5\) students in a class was reported to be \(60kg\). However, the average seems to be too low. So after re-examination, it was found that one student was actually \(80kg\) and was recorded incorrectly. After this correction, the actual average was \(70kg\). What was the weight which was recorded incorrectly?
A. \(20kg\)
B. \(25kg\)
C. \(30kg\)
D. \(50kg\)
E. \(80kg\)
10 Dec 2019, 01:14
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Bookmarks
MathRevolution
[GMAT math practice question]
The average weight of \(5\) students in a class was reported to be \(60kg\). However, the average seems to be too low. So after re-examination, it was found that one student was actually \(80kg\) and was recorded incorrectly. After this correction, the actual average was \(70kg\). What was the weight which was recorded incorrectly?
A. \(20kg\)
B. \(25kg\)
C. \(30kg\)
D. \(50kg\)
E. \(80kg\)
The average weight of \(5\) students in a class was reported to be \(60kg\). However, the average seems to be too low. So after re-examination, it was found that one student was actually \(80kg\) and was recorded incorrectly. After this correction, the actual average was \(70kg\). What was the weight which was recorded incorrectly?
A. \(20kg\)
B. \(25kg\)
C. \(30kg\)
D. \(50kg\)
E. \(80kg\)
Explanation:
Avg. Weight Initially=60Kg
Total students: 5
Total Weight Initially: 60X5= 300kg
After Correction Found Average increase to 70Kg.
So New Total Weight: 70X5 = 350Kg
Weight Difference : 350-300 = 50Kg.
Weight corrected was 80kg.
So difference: 80-50 = 30Kg.
IMO-C
10 Dec 2019, 21:26
Kudos
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MathRevolution
[GMAT math practice question]
The average weight of \(5\) students in a class was reported to be \(60kg\). However, the average seems to be too low. So after re-examination, it was found that one student was actually \(80kg\) and was recorded incorrectly. After this correction, the actual average was \(70kg\). What was the weight which was recorded incorrectly?
A. \(20kg\)
B. \(25kg\)
C. \(30kg\)
D. \(50kg\)
E. \(80kg\)
Average weight of 5 students increases by 10 kg after reexaminationThe average weight of \(5\) students in a class was reported to be \(60kg\). However, the average seems to be too low. So after re-examination, it was found that one student was actually \(80kg\) and was recorded incorrectly. After this correction, the actual average was \(70kg\). What was the weight which was recorded incorrectly?
A. \(20kg\)
B. \(25kg\)
C. \(30kg\)
D. \(50kg\)
E. \(80kg\)
Total increase in weight for 5 students is 50 kgs
Incorrect weight = correct weight - total increase in weight
= 80 - 50 = 30 Kgs
C is correct.
