Math Quiz: NYT Learning Network

Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network.  My latest contribution, a Test Yourself quiz-question, can be found here:

https://learning.blogs.nytimes.com/2011/06/01/test-yourself-math-june-1-2011/

This problem is based on the dwindling availability of hospstal emergency rooms around the country.