average age of 12 boys is 10 yeras and average of 11 boys is 9 years what will be age of 12
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Average of 12 boys is 10 years and average of 11 boys ( excluding 12th boy ) is 9 years.
Find the age of the 12th boy
Answer: 21 years
Step-by-step explanation:
Average = Sum of all ages / No. of students
10 = Sum of all ages / 12
Sum of all ages = 10 × 12 = 120
Average = Sum of all ages / No. of students (excluding the 12th boy)
9 = Sum of all ages / 11
Sum of all ages = 9 × 11 = 99
Therefore,
Age of the 12th boy = 120 - 99
= 21
Age of 12th boy = 21 years.
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