64.
In a class consisting of 100 students, 20 know English and 20 do not know
Hindi and 10 know neither English nor Hindi. The number of students knowing
both Hindi and English is
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so 20 students know English and another 20 people don't know Hindi and 10 know neither Hindi nor english so thats 50 in total but 30 dont know hindi and 20 know english so its hard to say that cause the other 50 left could all know hindi or all could know both languages or 50/50 there are a huge no. of possibilities
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