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They had 10,000 in August because they had 30,016 visitors with all 3 months combined so if they had 10,005 visitors in June and 10,011 visitors in July you add 10,005 + 10,011 which is 20,016 and to find the visitors in August you subtract 30,016 - 20,016 which gives you 10,000 so they had 10,000 visitors in August

but it is

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Step-by-step explanation: