Math, asked by Rajibb, 1 year ago

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member.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

Answers

Answered by QueenOfKnowledge
0

Let the sum of nine member (total) =x

and the age of old one=z

so its average 4 yrs before=(x+z)/10.

after 4 yrs let z be replaced by y.

so now avg=(x+4*10+y)/10

now (x+z)/10=(x+40+y)/10

so after solving it found

z=y+40.

so old person is 40yrs older than young one.


haribol1234p9zix3: hey
haribol1234p9zix3: can you plz explain why you have inserted (x+4×10+y) instead of (x+4×9+y)
haribol1234p9zix3: excluding the old member
haribol1234p9zix3: only 9 should be there
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