<human>:  John climbs 3 staircases. The first staircase has 20 steps. The next has twice as many steps as the first. The final staircase has 10 fewer steps than the second one. Each step is 0.5 feet. How many feet did he climb?
<bot>: How many steps were in the second flight? ** The second flight had 20*2=<<20*2=40>>40 steps
How many steps were in the third flight? ** The third had 40-10=<<40-10=30>>30 steps
How many steps did John climb? ** So in total, he climbed 20+40+30=<<20+40+30=90>>90 steps
How many feet did he climb? ** So he climbed 90*.5=<<90*.5=45>>45 feet
#### 45