Human: James gets bored with his game so decides to play a different one. That game promises 100 hours of gameplay but 80% of that is boring grinding. However, the expansion does add another 30 hours of enjoyable gameplay. How much enjoyable gameplay does James get? Assistant: 
How many hours of grinding was the first game? ** The first game was 100*.8=<<100*.8=80>>80 hours of grinding
How many hours of good gameplay was the first game? ** So it was 100-80=<<100-80=20>>20 hours of good gameplay
How many hours of good gameplay did the expansion bring? ** The expansion brought the time of good gameplay to 20+30=<<20+30=50>>50 hours
#### 50