5672脑筋急转弯简单数值题short

Trilingual Survey None-Count

题目

In a group of 100 people, 50 speak French, 40 speak German, 35 speak Spanish; 18 speak both French and German, 15 both French and Spanish, 12 both German and Spanish, and 6 speak all three. How many speak none of these three languages?

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