Problem number 7. On Michael's toy shelf, there are no turtles, no rabbits, and no robots. Which of these shelves could be Michael's shelf? To solve this problem, we will use the process of elimination by removing all the shelves that could not be Michael's shelf. For example, we know that Michael's shelf has no turtles, so we should cross out all the shelves that have a turtle. Similarly, we know that Michael's shelf has no rabbits, so we should cross out all shelves with a rabbit, and similarly, we should cross out all shelves with a robot. Now, if we look at all the shelves, A has a rabbit, C has a turtle and a robot, D has a robot, and E has a turtle and a rabbit, so none of them could be Michael's shelf. That means the only one remaining is B, and so Michael's shelf is shelf B.

Michael's shelf

process of elimination

toys

shelf B

no turtles rabbits robots