SOLUTION: The average age of a class of 30 students is 12 years. The average age of 5 students is 10 years. The average age of another group of 5 students is 14 years. What will be the avera

Question 758125: The average age of a class of 30 students is 12 years. The average age of 5 students is 10 years. The average age of another group of 5 students is 14 years. What will be the average of remaining students of the class?
Pls give answer with detail calculations.
Pls examplify the same.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
the definition of average is:
( total value of items ) / = average value of items
given:
( sum of ages ) / 30 = 12
Sum of ages = 360
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5 of the 30 students average 10 yrs old
( sum of ages of this group ) / 5 = 10
sum of ages of this group = 50
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another group of 5 of the 30 students
average 14 yrs old
( sum of ages of this group ) / 5 = 14
sum of ages of this group = 70
------------------
There are 30 - ( 5 + 5 ) = 20
students remaining
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For the remaining students:

The average age of remaining students is 12 yrs old

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