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There are 10 boys and 20 girls in Mrs Brook's class. Mrs Brook gave all the class a test. The mean mark for all the class is 60. The mean mark for the girls is 56. Work out the mean mark for the boys.
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There are 10 boys and 20 girls in Mrs Brook's class.

Mrs Brook gave all the class a test.
The mean mark for all the class is 60.
The mean mark for the girls is 56.
Work out the mean mark for the boys.

User Skistaddy
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