This one That one use in Hindi || English Speaking Class

The probability that a student selected at random from a class will pass in Hindi is 4/5 and the probability that he passes in Hindi and English is 1/2 . What is the probability that he will pass in English if it is known that he has passed in Hindi ?

Out of 15 persons 10 can speak Hindi and 8 can speak English.If two persons are chosen at random,then the probability that one peron speaks Hindi only and the other speaks both Hindi and English is

In a gathering of 100 people, 70 of them can speak Hindi, 60 can speak English and 30 can speak French. Further, 30 of them can speak both Hindi and English, 20 can speak both Hindi and French. If x is the number of people who can speak both English and French, then which one of the following is correct? (Assume that everyone can speak at least one of the three languages.)

Statements : All Americans are English speaking. No Eskimos are English speaking. Conclusions : I. No Eskimos are Americans. II. No English-speakers are Eskimos.