A teacher has 50 stickers, 20 buttons, and 100 ribbons. She wants to divide them so that each portion has an equal number of stickers, an equal number of buttons, and an equal number of ribbons. What is the maximum number of portions she can make?

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297