About This Set
These questions are a step up, closer to Tier 2: most need two steps or a careful setup, such as people leaving at different times, three people working in turns, a contractor who has fallen behind, wages when the team changes partway, a leak hidden in a slower filling time, or three pipes opened at different hours. The items marked [Tier 2] are the longest; if you are preparing only for Tier 1, you can keep them for a second round. Allow about 35 minutes. For the questions with turns or shifts, a quick day-by-day table stops you from giving someone a day he did not work. 18 or more right is a strong score on this set.