If p:q = 1/3 : 2 and p:r = 1/2 : 3/4 calculate the ratio p:q:r answer in simplest form

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?