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.
Muthu said:
1 decade ago
@Banu nice method.
Radhika said:
1 decade ago
Average of quantities is 22 and average of 36 quantities is 25. What is the average of all the 50 quantities?
Shiya said:
1 decade ago
@kumar
Hi kumar in the problem they are saying that it wil be effect 2.5 kg that means may be new person weight will be greater than other remaining 7 persons. In this situation they may be effect rite.
Hi kumar in the problem they are saying that it wil be effect 2.5 kg that means may be new person weight will be greater than other remaining 7 persons. In this situation they may be effect rite.
Jagat said:
1 decade ago
Thank for this simplication.
Kumar said:
1 decade ago
Here we are replacing the person of 65kg, then how 2. 5kg will effect to replaced person.
Isha said:
1 decade ago
Thanks bhanu your method is so good.
Bhanu said:
1 decade ago
Hai Friends.
Try this method.
New person weight =Replaced person weight+ (no. Of persons*increased weight).
Replaced person weight =65.
No. Of persons =8.
Increased weight =2.5.
These all values are replaced in the formula, then we get the answer "85".
Try this method.
New person weight =Replaced person weight+ (no. Of persons*increased weight).
Replaced person weight =65.
No. Of persons =8.
Increased weight =2.5.
These all values are replaced in the formula, then we get the answer "85".
(1)
Tinku said:
1 decade ago
@Aamir
It is not weight of the new person. It is weight of which person who is replace from the new person.
Let weight of new person is = x.
Replace person weight=65kg.
Total person=8.
Let total weight 8 person is W.
Before replace of a person.
W/8=a.
Here the a is the average.
Now replace a person which weight is 65kg.
(x+W-65)/8=a+2.5.
Put w=8a from above eqn.
Wet get x=85kg.
It is not weight of the new person. It is weight of which person who is replace from the new person.
Let weight of new person is = x.
Replace person weight=65kg.
Total person=8.
Let total weight 8 person is W.
Before replace of a person.
W/8=a.
Here the a is the average.
Now replace a person which weight is 65kg.
(x+W-65)/8=a+2.5.
Put w=8a from above eqn.
Wet get x=85kg.
Aamir said:
1 decade ago
A new person's weight is 65 kg and why add early 8 person, where as he is a replaced person.
Vinoth M said:
1 decade ago
When a new person weight is added to 8 peoples weight each person weight is increased by 2.5%
Then weight increased is 8*2.5=20
So the new person age is 65+20=85
Then weight increased is 8*2.5=20
So the new person age is 65+20=85
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