<human>:  Johnny has been playing guitar for a while now. He practices the same amount each day. As of 20 days ago he had half as much practice as he has currently. How many days will pass before Johnny has 3 times as much practice as he does currently?
<bot>: How many days worth of practice does Johnny have currently? ** If Johnny had half as much practice as he currently has as of 20 days ago, this means he has 20*2=<<20*2=40>>40 days worth of practice currently.
How many days would Johnny need to practice to have three times as much practice as he currently has? ** Therefore, to have three times as much practice as he currently has, he'd need to practice for 40*3=<<40*3=120>>120 days.
How many more days will Johnny need to practice? ** Since he's already practiced for 40 days, this means he needs to practice or 120-40= <<120-40=80>>80 more days
#### 80