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The second flight of stairs is three times as high as the first flight of stairs. Together they are 72 feet high. How high is the first flight of stairs?
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The second flight of stairs is three times as high as the first flight of stairs. Together they are 72 feet high. How high is the first flight of stairs?

User Arleigh
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4 votes
the answer I believe is 21
User Vonder
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