What is the probabiliy that Pinder will pass both exams

Pinder has examinations coming up in data management and biology. He estimates that his odds in favour of passing the data-management examination are 17:3 and his odds against passing the biology examination are 3:7. Assume these to be independent events.

a) What is the probabiliy that Pinder will pass both exams

I know that you have to find the probability of each first, then multiply them, but how do you find the probability?

thanks.

Odds are in a ratio. For instance, out of 20 attempts, he will pass 17 times and fail 3 times.

So, the probability of passing is 17/20. See?. 17+3 = 20.