there are 20 children at a library 6 of the children have an average age of five years the remaining children have an average ag
e of 8 years what is the average age of all the children at the library
1 answer:
Remaining children = 20-6=14
So 14 children have age of 8 years old.
Average age = (6*5+14*8)/20 ≈ 7.1 ≈ 7 years old
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