How to speak like professionals through tenses

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

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 ?

(i) In a group of 50 people , 35 speak Hindi , 25 speak both English and Hindi and all people speak atleast one of the two languages . How may people speak only English and not Hindi ? How many people speak English? (ii) In a group of people , 50 speak both English and Hindi and 30 people speak English but not Hindi All the people speak at least one of the two languages . How many people speak English ?

In a group of 50 people,35 speak Hindi,25 speak both English and Hindi and all the people speak at least one of the two languages.How many people speak only English and not Hindi? How many people speak English?

In a group of 1000 people, there are 750 who can speak Hindi and 400 who can speak Bengali. How many can speak Hindi only? How many can speak Bengali only? How many can speak both Hindi and Bengali?