In a statistical investigation of 1003 families of Calcutta, it was found that 63 families has neither a radio nor a t.v,794 families has a radio and 187 has T.V. The number of families in that group having both a radio and a T.V is

Out of 100 families in the neigh bourhood, 50 have radios, 75 have TVs and 25 have VCRs. Only 10 families have all three and each VCR owner also has a TV. If some families have radio only, how many have only TV?

In a survey of a town, it was found that 65% of the people surveyed watch the news on T.V., 40% read a newspaper and 25% read a newspaper and watch the news on T.V. What per cent of the people surveyed neither watch the news on T.V. nor read a newspaper?

Name the following : The crystalline form of silica used in modern radio and T.V broadcasting and mobile radio communication.

A family has a man, his wife their 4 sons and their wives. The family of every son also have 3 sons and one daughter each. Find out the total number of male members.