Aptitude - Average - Discussion
Discussion Forum : Average - General Questions (Q.No. 5)
5.
The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?
Answer: Option
Explanation:
Total weight increased = (8 x 2.5) kg = 20 kg.
Weight of new person = (65 + 20) kg = 85 kg.
Video Explanation: https://youtu.be/ceg2jvHsiJU
Discussion:
84 comments Page 8 of 9.
Honey said:
10 years ago
But one person is excluded from 8 and a new person comes?
Victor said:
10 years ago
Can I have some more tricks?
Mahnoor said:
10 years ago
I'm totally confused. Why method change again an again?
Saravanan said:
10 years ago
Replaced value+(Increase in average*Total number of observation).
Priyanka VERMA said:
9 years ago
Let average = x.
Then, sum = 8x.
Now after replacement:
8x - 65 + y = 8 (x + 2.5),
8x - 65 + y = 8x + 20.
y = 65 + 20.
y = 85.
Then, sum = 8x.
Now after replacement:
8x - 65 + y = 8 (x + 2.5),
8x - 65 + y = 8x + 20.
y = 65 + 20.
y = 85.
Sneha said:
1 decade ago
@Manoj Kumar Sir, your tricks are really useful.
Fakhar said:
1 decade ago
I am totally confused. Can any one give me solution?
Sarvesg said:
1 decade ago
The first line says average weight weight of person is increased by 2.5.
1) So the total weight increase is = 2.5*8 = 20.
2) Then it says when old person weighting 65 kg is replaced by new one since the weight increase is because of only one person add the old person weight+the average weight = 65+20 = 85.
1) So the total weight increase is = 2.5*8 = 20.
2) Then it says when old person weighting 65 kg is replaced by new one since the weight increase is because of only one person add the old person weight+the average weight = 65+20 = 85.
B.E(Bekar Engg) said:
1 decade ago
Let average of 8 person weight = x;
x/8 = 2.5;
x = 8*2.5.
x = 20;
New person is add with weight = 65.
65+20 = 85.
Ans = 85;
x/8 = 2.5;
x = 8*2.5.
x = 20;
New person is add with weight = 65.
65+20 = 85.
Ans = 85;
Hemanth said:
1 decade ago
Weight of newly came person is = Weight of replaced person + (no of persons*increased in weight).
=>65+ (8*2.5).
=>65+20.
=>85.
=>65+ (8*2.5).
=>65+20.
=>85.
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