For the life of me I cannot start this question to me this does not make sense?

In a certain school, it is know that 80% of the student’s user the internet for school projects 60%m use e-mail on regular basis, and 90% use the internet for school projects or for e-mail on a regular basis. A student from this school is selected at random. Determine the probability that the student used e-mail, given that the student used the internet for school projects

Would I go like this:

1/80 x 1/60 = 2.08 x 10^4 this does not make sense??????