Out of 25 residents in a housing society, 10 can speak Italian, 13 can speak Mandarin, and 5 do not speak either of the two languages. How many residents can speak only one of the two languages?
(a) 25
(b) 23
(c) 20
(d) 17
Explanation
Residents who speak at least one language = 25 − 5 = 20
Let number of residents who speak both = x
Then:
Only Italian = 10 − x
Only Mandarin = 13 – x
So,
(10 − x) + (13 − x) + x = 20
x = 3
Thus, number of residents who speak only one language =
(10 − 3) + (13 − 3) = 7 + 10 = 17
Hence, option d is correct.
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