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OpenStudy (anonymous):
Anna did a survey to find out how many campers had hiked, biked or surged that day. she found that 26 had hiked, 18 had biked, and 18 had surfed. Six of the campers had done all three. She found that 9 had hiked and biked, and that 8 had biked and surfed. Nine had only surfed. How many campers did Anna survey?
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