Critical Thinking Exercises
33. Gym lockers are to be numbered from 1 to 99 using metal numbers to be nailed onto each locker. How many 7's are needed?
34. You are on vacation in an isolated town. Everyone in the town was born there and left. You develop a toothache and out the two dentists in town. One dentist has gorgeous teeth and one has teeth that show the effects of poor dental work. Which dentist should you choose and why?
35. India Jones is standing on a large rock in the middle of a square pool filled with hungry, man-eating piranhas. The edge of the pool is 20 feet away from the rock. India's mom wants to rescue her son, but she is standing on the edge of the pool with only two pla each 19 feet long. How can India be rescued using the two planks?
36. The stars in the American flag can be counted in a num ber of different ways. Counting along the diagonals, we see that there are 50 stars: Imagine that a new state (perhaps Washington D.C. or Puerto Rico) joins the United States. You have the task of