Mathematics, 22.08.2021 17:30 daniellecraig77

In a class of 80 students in Debre Berhan University, 45 are good in mathematics, 15 are good in both mathematics and English, 13 are good in both Mathematics and Psychology, 16 are good in both English and Psychology only,20 are good in Psychology and 9 are good in both of the three course, then how many students are good in mathematics?

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