Mathematics, 11.05.2021 23:00, GaudySky

Q7. There are 15 children at a birthday party.
The mean age of the 15 children is 7 years.
9 of the 15 children are boys.
The mean age of the boys is 5 years.
Work out the mean age of the girls.

Answers: 1

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Q7. There are 15 children at a birthday party.
The mean age of the 15 children is 7 years.