Afamily has two cars the first car has a fuel efficiency of 20 miles per gallon of gas and ii has fuel efficiency of 30 miles per gallon of gas during one particular week, the two carswent a combined total of 1550 miles, for a total gas consumption of 65 gallons how many gallons are consumed by each of the two cars that week?

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