posted by Anonymous .
Rudy must play 12 commercials during his 1-hr radio show. Each commercial is either 30 sec or 60 sec long. If the total commercial time during that hour is 10 min, how many commercials of each type does Rudy play?
60 seconds * 10 minutes = 600 seconds
Divide by 30 and then divide by 60 to find the number of commercials.