Kathy is twice as old as mary. kathy is 2 yrs younger than jon. the sum of all three ages is 77. how old is kathy?

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?