In chemistry class, the ratio of passing grades to failing grades is 7 to 5. how many of the 36 students failed the chemistry class?

Passing to failingratio 7:5added = 12
so 7/12 of the total students are passing and 5/12 of the total students are failing. There are 36 total students.

7/12(36) = 252/12 = 21 are passing
5/12(36) = 180/12 = 15 are failing <==

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