English

English, 21.08.2019 23:00, katherineweightman

Asurvey of 100 students was taken concerning their knowledge of foreign languages. the results were as follows:
30 know french
19 know german
16 know russian
11 know both french and russian
12 know both french and german
6 know both german and russian
4 know all three languages
how many students do not know any of the three languages?

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