Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 15)
15.
A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:
Answer: Option
Explanation:
Let there be x pupils in the class.
| Total increase in marks = |  |
x x | 1 |  |
= | x |
| 2 | 2 |
 |
x | = (83 - 63)  |
x | = 20 x= 40. |
| 2 | 2 |
Discussion:
123 comments Page 10 of 13.
Kanmani said:
9 years ago
I too have that same doubt @Maria Ninan.
Can anyone clarify it?
Can anyone clarify it?
Swathy said:
1 decade ago
Rakesh I cant understand your logic can you explain clearly?.
Sharma said:
8 years ago
@Vishal explain it please.
7x/4y +2x/9y = 1/1.
we get 2:3.
7x/4y +2x/9y = 1/1.
we get 2:3.
Kush said:
7 years ago
I am not getting it. Please someone explain to me briefly.
Himani said:
5 years ago
Avg = total marks/No. Of pupil.
1/2 = 20/x,
X = 40.
1/2 = 20/x,
X = 40.
Zubayer said:
7 years ago
Let, pupil=x and real avrge=63.
xy+20=(y+1/2)x.
xy+20=(y+1/2)x.
Vinodha said:
7 years ago
I didn't understand this please explain clearly.
Kabir said:
6 years ago
Increased by half is old + 1/2 not (1.5 * old).
Prithika said:
6 years ago
I am not understanding this, please explain it.
Android said:
1 decade ago
I didn't understand the logic. Please explain.
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