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/2011/07/11/test-yourself-math-july-11-2011/

This problem is based on the number of home-schooled children in the U.S.