In a committee there are 25 members. If
two members whose ages are 64 years and 40
years are replaced by the two new members, then
average age of 25 members is dereased by 2
years. What is the average age (in years) of the
new members?
Answers
Answered by
0
Step-by-step explanation:
No. of members = 25
Let x be the mean age
Total Age - 104 + a + b = 25(x-2)
a+b = 104-50
a+b = 54
(a+b )/2 = 27
Hence the average age of the New members is 27
Answered by
0
Answer:
75
Step-by-step explanation:
let x be the average age of the 1st 25 persons,
=> the sum of the 1st 25 persons = 25x
after replacement of 2 persons,
given , average of 2nd 25 persons = x - 2
=> the sum of the 2nd 25 persons = 25x-50 [ ie., 25(x-2) ]
=> difference between the 2 sums = 50
let the 2 ages of the replaced persons = y
=> y -104 = 50
=> y = 50+104 = 154
=> 23x + 154 = 25x
=> 25x-23x = 154
=> 2x = 154
=> x = 154/2 = 77
=> the new avg = 77-2 = 75
Similar questions