the average age of 12 boys is 10 years if the average age of 11 boys is 9 years what will be the age of 12th boy
Answers
Answered by
2
Answer:
average of 12 boys=
total age of 12 boys/ total boys
according to question ::--
total age of 12 boys = 12 × 10 = 120
total age of 11 boys = 11 × 9 = 99
we can write total age of 12 boys =
(age of 11 boys + age of 12th boy)
120 = 99 + age of 12th boy
age of 12th boy = 21
Answered by
4
Answer:
Hope this answer might clear your doubt
Step-by-step explanation:
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
=21 years
Hence age of the 12th boy is 21 years
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