Math

Can you find the mistake in this SAT question?

This question appeared on the October 1980 SAT exam. Like all questions, it was supposed to have exactly one correct answer. However the test-makers made a mistake. Can you figure out what they did wrong?

Blog post (text explanation): http://wp.me/p6aMk-4vX

Source
Fiske, Edward B. “A Second Student Wins Challenge on Answer To Math Exam Problem.” New York Times. 24 March 1981. Accessed online. http://www.nytimes.com/1981/03/24/nyr…

H/T: http://mathlair.allfunandgames.ca/sat…

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