Every student in the senior class is taking history or science. There are 200 seniors in the class. If there are 126 seniors taking 129 history and  seniors taking science, how many students are taking both history and science?

 Sep 9, 2018

126 history + 129 science = 255 student-courses

200 students total   sooooo    255-200 = 55 taking BOTH science and history

 Sep 9, 2018

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