56. Suppose that n students are taking both a mathematics course and a computer science course
Then 4n students are taking a mathematics course, but not a computer science course, and 7n
students are taking a computer science course, but not a mathematics course. The following
Venn diagram depicts the situation:
'$Math CompSci4n n 7n&%Thus, the total number of students is
4n + n + 7n = 12n.
The proportion taking a mathematics course is
5n
12n = 5
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