I can't seem to understand this problem. Can anyone break this down for me?

Suppose the probabilties taht an adult has high blood pressure and/or high cholesterol are displayed in the table.

Cholesterol

High OK

Blood High .17 .24

Pressure OK .13 .46

If a subject is randomly selected, what is the probability that an adult has high blood pressure given that the subject's cholesterol is high? ------- (Round to the nearest thousandth)