Tim watches 2 shows.  One of them is a half-hour show per episode and the other is a 1-hour long show per episode.  The short show had 24 episodes and the long show had 12 episodes.  How many hours of TV did he watch?
The short show has 24*.5=<<24*.5=12>>12 hours of TV
The long show is 12*1=<<12*1=12>>12 hours
So in total he watches 12+12=<<12+12=24>>24 hours
#### 24