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Mathematics, 30.12.2020 17:20 dee6991

There are 10 boys and 20 girls in a class. the class has a test.
the mean mark for the class is 60.
the mean mark for the girls is 54.
work out the mean mark for the boys.

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There are 10 boys and 20 girls in a class. the class has a test.
the mean mark for the class...

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