MATH

Last Saturday, 215 people saw movie x, 25 people saw movie w, and 15 people saw both movie x and w. Neither of the 200 people saw z movie. How many people saw one movie on Saturday.

Please show the problem step by step to get the answer. I added 215 + 25 + 15 to get 255. Then 255-200 to get 55. Is this correct?

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  1. If you just add up x and w, you count twice all those who saw both.
    So, let's say b people saw both.
    That means the total people who saw either x or w or both is
    215 + 25 - 15 = 225
    200 saw only x
    10 saw only w
    15 saw both

    No idea what z movie is, or who "Neither of the 200 people" are. Maybe you can resolve these issues yourself.

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