conversations.from: human
conversations.value: 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?
  Find the solution.
conversations.from: assistant
conversations.value: Day 1: 70(.20)=14 miles
  70-14=56 miles remaining
  Day 2:56/2=28 miles
  56-28=28 miles remaining