Question 10
Among $140$ households, $90$ have Internet, $70$ a landline and $60$ cable TV. Of these, $50$ have Internet and a landline, $20$ have a landline and cable TV, and $15$ have all three. Five have none. How many have both Internet and cable TV (including those with all three)? Diagram labels: I = Internet, L = landline, TV = cable TV.
