## 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

Question

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## Answers ( )

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

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.