SOLUTION: In a group of 16 people, 7 people have studied Russian, 9 have studied Chinese, and 3 have not studied either. How many of these people have studied both Russian and Chinese?

Question 378768: In a group of 16 people, 7 people have studied Russian, 9 have studied Chinese, and 3 have not studied either. How many of these people have studied both Russian and Chinese?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
16 - 3 = 13 people who have not studied either Chinese or Russian. Hence N(Chinese OR Russian) = N(Chinese) + N(Russian) - N(Russian AND Chinese) gives 13 = 9 + 7 - N(Russian AND Chinese), or N(Russian AND Chinese) = 9+7 - 13 = 3.
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