Ok, first take each person individually. The question doesn't give you a standard for any of them to start with, so call them all "x". Now, it says Jane types 4/3 as fast as Shirley, so, the ratio of Janes typing to Shirleys is 4x to 3x. Then it says the ratio of Shirley to Beth is 3/2, since Shirley is 3x, Beth is 2x. Now all of those add together to type a total of 9810 words, so 2x + 3x + 4x = 9810. 9x = 9810, x = 1090. Now that you know what x is, plug it back in to find out the exact amount Shirley typed....so 3(1090) = 3270. Hope that helps.
