<human>:  Bob, a marathon runner, is preparing for a race. He runs a total of 70 miles in the 3 days leading up to the race. On day one he runs 20 percent of the total miles and on day 2 he runs 50 percent of the remaining miles. How many miles does he run on day three to complete the 70 miles?
<bot>: How many miles does Bob run on Day 1? ** Day 1: 70(.20)=<<70*.20=14>>14 miles
How many miles does Bob have left after Day 1? ** 70-14=<<70-14=56>>56 miles remaining
How many miles does Bob run on Day 2? ** Day 2:56/2=<<56/2=28>>28 miles
How many miles does he run on day three to complete the 70 miles? ** 56-28=<<56-28=28>>28 miles remaining
#### 28