Daily used English words with hindi meaning

In a committee, 50 people speak Hindi, 20 speak English and 10 speak both Hindi and English . How many speak at least one of these two languages ?

One Word, Many Word and Hindi Meaning

One Word, Many Word and Hindi Meaning

If all the words,with or without meaning,are written using the letters of the word QUEEN and are arranged as in English dictionary,then the position of the word QUEEN is:

In a class, 30% students study English, 15% study Hindi and 10% study both English and Hindi. One student is selected at random. Find the probability that (i) He studies English if it known that he Hindi (ii) He studies Hindi if it is known that he studies English