The average age of 12 boy is 10 year if average age of 11 boys is 9 year. What will be the age of 12th boy.
neeraj4frd:
Answer thk ha
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Answered by
8
Average ages of 12 boys=10
Sum of observations =Average*No. of observations
=10*12
=120
Average ages of 11 boys=9
Sum of observations =Average*No. of observations
=9*11
=99
Age of 12th boy =120-99
=21years
Sum of observations =Average*No. of observations
=10*12
=120
Average ages of 11 boys=9
Sum of observations =Average*No. of observations
=9*11
=99
Age of 12th boy =120-99
=21years
Thank you
Answered by
4
sum of age of 11 boys =y
y/11=9
y=99
99+z/12=10
99+z=120
z=21
y/11=9
y=99
99+z/12=10
99+z=120
z=21
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