Apancake recipe calls for 3 cups of flour to 1 cups of milk. keeping things in proportion, what is the ratio of flour to milk if you double this recipe

100,000 random people were tested for condition a. roberto's doctor told him he tested positive for condition a. if the test is 99% accurate and condition a is rare—one out of every thousand people have it. what is the probability that testing positive means roberto has condition a? 99.0% 1% 9% 99.9%