et x be the sum of the other 20 numbers
n=4*x/20=x/5
the sum of 21 numbers is x/5+x=6x/5
n / sum of 21 numbers is:
(x/5)/(6x/5)=5x/30x=1/6
Ans B
n=4*x/20=x/5
the sum of 21 numbers is x/5+x=6x/5
n / sum of 21 numbers is:
(x/5)/(6x/5)=5x/30x=1/6
Ans B
