Problem: Among 50 people, 35 can speak English, 25 can speak both English and and bangla and each can speak at least in one of the two languages. How many of them can speak only bangla?
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Correct Answer: Only 15 people speak in Bangla.
Explanation:
Here, the necessary rule is Total = English + Bangla – Both + None
=> 50 = 35 + Bangla – 25 + 0
so, Bangla = 40
So total 40 people speak Bangla
Speak only Bangla = 40 – 25 = 15