Tim has some marbles. Sue has twice as many marbles as Tim.
Jim has 15 marbles.
Tim, Sue and Jim have the a total of 63 marbles.
How many marbles does Tim have?​

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?