Difference between revisions of "2012 AMC 12B Problems/Problem 7"
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Revision as of 19:50, 24 February 2012
Problem
Small lights are hung on a string 6 inches apart in the order red, red, green, green, green, red, red, green, green, green, and so on continuing this pattern of 2 red lights followed by 3 green lights. How many feet separate the 3rd red light and the 21st red light?
Note: 1 foot is equal to 12 inches.