Know the numbers for JEE

To determine the density of a population you would need ot know the number of individual and

A group of 30 men participate in a sruvey on language skills. The number of men whoe know both English and Hindi was equal to the number of men who know neither of these language . The number of men who know English is 4 more than those who know Hindi. How many know Hindi?

In a state with a population of 75 x 10^6, 45% of them know Hindi, 22% know English, 18% know Sanskrit, 12% know. Hindi and English, 8% know English and Sanskrit, 10% know Hindi and Sanskrit and 5% known all the three languages What is the number of people who do not know any of the above three languages? What is the number of people who know only Hindi . What is the number of people who know only Sanskrit? What is the number of people who know only English? What is the number of people who know only one language? What is the number of people who know only two languages?

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