this学校の定期テストに出てきてわかりません

T

= Taku, K= Kate
1: Kate, do you read a newspaper?
K: Not often, but sometimes. How about you, Taku?
T: Me, too. Ms. Tanaka asked one hundred students about reading newspapers. In graph 1, you can see that fifteen students read a newspaper every day and twenty-five students don't read a newspaper every day, but they read one "often".
K: And twenty students "sometimes" read newspapers. Forty students don't read newspapers, right?