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.
Let's be accurate as possible and think first.
400
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.

.

Final answer: 400