Latest Accenture Aptitude Question SOLUTION: The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member?

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The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member?

Asked In Accenture (14 years ago)

Solved C.T.Narayanan Read Solution (9)

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Read Solution (9) :

MANOJ  (13 years ago)

Let the members be Old Having age O + other 9 having ages x and New one having age Y
Sum of their ages = (Y + 9 × x) and average = (Y + 9 × x)/10
Before 4 years sum was (O + 9 x – 10 × 4) and average = (O + 9 x – 10 × 4) /10
equating, Y + 9 x = O + 9x – 40
Y = O – 40
Younger is 40 years younger than Old one.

Is this solution Helpfull? Yes (30) | No (8)  

raaz yadav  (9 years ago)

answer : 40 years
try it in funny way :)
let all 10 member age is 5, 5 years
so avrg of member in current = (5+5+5+5+5+5+5+5+5+5)/10 = 50/10
before 4 years memners avrg age was = (1+1+1+1+1+1+1+1+1+1)/10= 10/10
bt sum of age should be same as 50 as said in d qstn it means any of members age should be 41 years
so sum of age will be 50 years
so replaced member age should be of 41 years
then how much younger is d new member = 41-1= 40
:)

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C.T.Narayanan  (14 years ago)

40 years younger than the old member

Is this solution Helpfull? Yes (4) | No (4)  

Pooja baghel  (9 years ago)

if suppose a1......a10 be the age of the 10 members respectively..
a1+a2+.....+a10=n
avg=n/10
after 4 yrs
a1+4+a2+4+.......+A10+4=n+40
avg=(n+40)/10
so 40 remain
younger is 40 year younger than old one

Is this solution Helpfull? Yes (4) | No (1)  

Dr.Dipin Singh  (14 years ago)

40 years

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shashwat bhargava  (8 years ago)

answer is 40 years as reduce 10 person's age by 4...that comes out to be ..................40(10*4)

Is this solution Helpfull? Yes (1) | No (2)  

sanchit  (14 years ago)

a+b+c+d+E/5=X and a+b+c+d+F-20/5=X we get f-e=20 and hence d answer is 20

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devender singh saini   (14 years ago)

40 years younger

Is this solution Helpfull? Yes | No (6)  

Sai Krushna Rath  (7 years ago)

as in four years the average should increase by 4 years.but remains the same so as average denotes value per person .so for 10 members it is 40*10=40.

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