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This SAT Math Question Has A Mistake

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 SAT   |   Math
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Description

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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