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Mathematics, 24.02.2021 19:00 ashlon98

There are 10 boys and 20 girls in a class. The class has a test.

The mean mark for all 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 all...

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