In a language survey of students it is found that 80 students know English, 60 know French, 50 know German, 30 known Enlgish 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?

In a language survey of students it is found that 80 stud

1.	In a language survey of students it is found that 80 students know English, 60 know French, 50 know German, 30 known Enlgish 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?
A.	135
B.	30
C.	10
D.	45
Answer» B. 30

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