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 5 of 9.
Chitti said:
9 years ago
The average age of a group of 12 persons is 40 years. If one more person is included then average increases by 1. What is the age of new person?
Niraj shrestha said:
8 years ago
The average of six consecutive integers in increasing order size is 9.5. What is the average of the last three numbers?
Can anyone solve this?
Can anyone solve this?
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.
Rasiga said:
9 years ago
There is very simple formula for this.
Weight of New person = No of Persons * Increased weight + Replaced.
So, 8 * 2.5 + 65 = 85.
Weight of New person = No of Persons * Increased weight + Replaced.
So, 8 * 2.5 + 65 = 85.
Saravanan said:
6 years ago
Let x be an average of 8 persons.
Let y be the weight of the new person.
(x+y-65)/8 = (x/8)+2.5,
x+y-65 = x+20,
y-65 = 20,
y = 85.
Let y be the weight of the new person.
(x+y-65)/8 = (x/8)+2.5,
x+y-65 = x+20,
y-65 = 20,
y = 85.
(4)
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.
Sandeepkumar said:
1 decade ago
Let x be the average weight,
Total weight incremented is = x+ 2.5.
Then,
avg.
7x-65 = 8(x+2.5).
7x-65 = 8x+20.
Then x = 85.
Total weight incremented is = x+ 2.5.
Then,
avg.
7x-65 = 8(x+2.5).
7x-65 = 8x+20.
Then x = 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;
Marshall said:
8 years ago
The mean mass of 5 men is 78kg, the mass of four of them are 74kg, 76kg, 77kg and 86kg, please what is the mass of the fifth?
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?
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers