the avarage Age of 12 boys is 10 years. if the average of 11 boys is 9 years what will be age of 12th boy
Answers
Answered by
0
Answer:
Hí friends,
Good morning and Happy Rakshabandhan
answer of your question is 21.
Step-by-step explanation:
If the average age of 12 boys is 10 then addition of their age is 120.
if the average age of 11 boys is 9 then addition of their age is 99
then the age of 12 th boy is 120-99= 21 .
Thank you.
Answered by
1
Answer:
21 yrs
Step-by-step explanation:
Given, Mean of age of 12 boys = 10
(Sum of ages of 12 boys)/12 = 10
Sum of ages of 12 boys=120⇒eq.1
Similarly,
Sum of ages of 11 boys / 11 = 9
Sum of ages of 11 boys =99
Age of 12th boy = Sum of ages of 12 boys - Sum of ages of 11 boys
= 120 - 99
= 21
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