[math-fun] math problem from the ISEE

I'm interested in what people may think of the following math problem from a document entitled "What to Expect on the ISEE." The ISEE is a widely-required exam for students applying to private middle schools in the US Sharpen your No. 2 pencils please, then click the URL below http://www.flickr.com/photos/thane/65247884/ -- Thane Plambeck http://www.plambeck.org/ehome.htm