Question 253195
 In a group of 80 high school student, 30 study Spanish, 40 study French, and 25 study neither Spanish nor French. How many of 80 students study both Spanish and French?
(s and f) = s + f - (s or f)
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Note:
(s or f) = 80-(s or f)' = 80 - 25 = 55
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Therefore:
s and f = 30 + 40 - 55
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s and f = 15
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Cheers,
Stan H.
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(A) 18 (B) 15 (C) 20 (D) 16 (E) 13