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Mathematics, 30.07.2019 01:30 Yoma321

Class 10r sat a test. the mean mark of 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 mark for the girls.

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