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Mathematics, 03.03.2021 15:40 germaine88

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

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

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