In a language survey of students it is found that 80 students know English, 60 know French, 50 know German, 30 known English and French, 20 know French and German, 15 know English and German and 10 students know all the three languages. How many students know at least one language?
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60+50+80=190 students know only one language
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40 English
15 french
30 German
if it is correct like it
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