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  • The average age of 30 students of a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. What is the average age of the remaining students?(1) 8 years (2) 10 years (3) 12 years

The average age of 30 students of a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. What is the average age of the remaining students?(1) 8 years (2) 10 years (3) 12 years (4) 14 years (5) None of these​

Answers (1)

The average of 30 students = 12

Sum of the ages in a class= 30x12=360

The sum of ages of group 1=10x5=50

The sum of ages of group 2=14x5=70

The sum of ages of remaining student= 360-(70+50)=240

The average age of the remaining 20 student=240/20=12

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Safeer PP

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