Mathematics, 18.06.2020 22:57, 719729

In a class of twenty students, 6 have an average of 40%, 8 have an average of 50%, while the other 6 have an average of 60%. What is the average score for the whole class?

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In a class of twenty students, 6 have an average of 40%, 8 have an average of 50%, while the other 6...