From the New York Times today - Are You Smarter Than An 8th Grader? by Nicholas Kristof. Only seven percentage of American eighth graders were able to solve the following problem. In contrast, 53% of Singaporean eighth graders answered correctly.
"A piece of wood was 40 centimeters long. It was cut into three pieces. The lengths in centimeters are 2x-5, x+7 and x+6. What is the length of the longest piece?"