In a scenic spot, adult tickets and child ticket accounted for 60% and 40% of the tickets sold in one year. Sales of adult tickets were 75% of the total turnover. Which of the following may be the selling unit price of adult ticket and child ticket?
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A18; 10
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B19; 7
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C20; 9
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D20; 10
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E78; 32
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正确答案: D