conversations.from: human
conversations.value: While driving up a road, Philip passed through 5 intersections. 4 crosswalks marked each intersection with a total of 20 lines per crosswalk. Calculate the total number of lines of the crosswalks in the five intersections.
  Solve it.
conversations.from: assistant
conversations.value: If one intersection has 4 crosswalks, with 20 lines per crosswalk, there are 20*4 = 80 lines in all the crosswalks per intersection.
  If there are 5 intersections, the total number of lines in all the intersections is 80*5 = 400 lines