How many of the students in a certain class are taking both a history and a science course?

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How many of the students in a certain class are taking both a history and a science course?

1) Of all the students in the class, 50 are taking a history course.
2) Of all the students in the class, 70 are taking a science course.

Answer: E

Source: GMAT Prep
Source: — Data Sufficiency |