Mathematics, 06.05.2020 13:57, AM28

Class 10R sat a test The mean mark for the class was 70% there are 30 students in class 10R, 20 of whom are boys the mean mark for the boys in the test was 62% work out the mean marks for the girls

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Class 10R sat a test The mean mark for the class was 70% there are 30 students in class 10R, 20 of w...