Let us assume the two persons who can speak two languages speak Hindi and Tamil. The third person then speaks all the three languages.
Tamil ? Number of persons who can speak is 6. Only Tamil 6 ? 2 ? 1 = 3
Hindi - Number of persons who can speak is 15. Only Hindi 15 ? 2 ? 1 12
Gujarati ? Number of persons who can speak is 6. Only Gujarati 6 ? 1 = 5
Thus the number of persons who can speak only one language is 3 + 12 + 5 = 20
Number of persons who can speak two languages = 2
Number of person who an speak all the languages = 1
Total number of persons = 23.
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