Question

there are 20 children at a library 6 of the children have an average age of five years the remaining children have an average age of 8 years what is the average age of all the children at the library

Answer 1

( 6 chldren x 5 years) = 30
(14 children (remaining #) x 8 years) = 112
30+112= 142.
142/( total # of children (20)) = 7.1