In an examination, 80% of students passed in Maths and 70% in Science while 12% failed in both the subjects. If 310 students passed in both the subjects, find the total number of students who appeared in the examination.
In a locality 65% of the families read Times of India, 75% read Indian Express, 15% read neither. If 330 families read both the newspapers, how many families lived in that locality? Draw a Venn diagram to solve the problem.