Jeff is playing a new video game. The goal is to explore a cave with many levels and collect gold coins. In order to get through a door to the next level, you must master a secret code. Jeff’s video character has four pockets on his jacket. The top left pocket is marked 3/6, the top right pocket is marked 5/15, the lower left pocket is marked 8/12 and the lower right pocket is marked 9/12. Above the cave door at each level is a number card. To open the door, he must take the number card from the door and put it in the correct pocket. If he puts it in the wrong pocket, he loses one of his 3 lives. Here are the cave doors he must