There are only 7 regions. Name them and label them.

A - A alone

B - B alone

C - C alone

AB - A&B but not C

AC - A&C but not B

BC - B&C but not A

ABC - All Three

AB+AC+BC+ABC = 35at least two are read by 35% of the population

C + AC + BC + ABC = 45newspaper C is read by 45% of the population.

ABC = 10all the three papers are read by 10%

This is where I get lost. I do not know what this means.A and B are read by 15%

It might be: AB = 15

If so, a little substitution and subtraction solve the problem.

AB = 15

ABC = 10

AC+BC = 10

C = 25