AMC 12 2012b Problem 7
- Paper
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.
\textbf{(A)}\ 18 \textbf{(B)}\ 18.5 \textbf{(C)}\ 20 \textbf{(D)}\ 20.5 \textbf{(E)}\ 22.5
Dataset text AMC 12 2000 to 2025. Quoted with source.
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E
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