A firefighter is standing on the middle bar of a ladder to extinguish a fire. As the smoke gets less dense, he climbs up 3 bars. An explosion occurs and forces him to go down 5 bars. A few minutes later, he is able to climb 7 bars. Finally, the fire is out and the firefighter can climb the last 6 bars.
How many bars are there in total in the ladder?
Charles, Vincent, Charles-Émeric
When you are all finished: