Respuesta :

Answer:

1/2

Step-by-step explanation:

P( senior or drives to school) = number of seniors or drives to school / total

35 seniors + 40 drivers - 25 seniors who drive = 50

We do not count the seniors who drive twice

P( senior or drives to school) = number of seniors or drives to school / total

                                                = 50/100

                                                = 1/2