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 6 of 9.
Ankit saxena said:
1 decade ago
Remember the formula for this type of
new person weight=weight of person tht left+total men*average increased after entry of new men...
Hope it wil help u all
new person weight=weight of person tht left+total men*average increased after entry of new men...
Hope it wil help u all
Chithramol ER said:
1 decade ago
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 as 85
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 as 85
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?
Muthu said:
1 decade ago
@Banu nice method.
VIRAT said:
1 decade ago
@Sweta weight of 8 persons is increasing when a new person is coming by replacing a person whose weight is given 65 kg,
Now to know the weight of new person we have add the increased weight in 65 kg simple.
8*2.5 = 20 kgs.
So now the weight of new person is 65+20 kg = 85kg.
Now to know the weight of new person we have add the increased weight in 65 kg simple.
8*2.5 = 20 kgs.
So now the weight of new person is 65+20 kg = 85kg.
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.
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.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers