There are 15 children at a birthday party.
The mean age of the 15 children is 7 years.
9 of th...
Mathematics, 03.03.2021 20:30 jackfrost5
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: 3
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