Two tests were administered in class, 30% of the students passed both tests and 60% passes the first test. what percentage of students passes the second test given that they passes the first test?

The percent would be 50%.

To answer this question, we need to find the percent of students that passed the test the second time.  To do this, we need to write and solve the equation below. It multiplies the first and second test together to get the combined probability.

0.6 x S = 0.3
S = 0.5