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.

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…

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