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A group of parents and their kids bought both tickets and food at a theme park. The total number of parents is the same as the total number of kids. The ticket price for parents and kids is 20 and 10 dollars each, respectively. If they spent 420 dollars in total on tickets, and the ticket and food cost them 21 dollars on average, then how much did they spend on food in total?
______dollars
168 显示答案
以上解析由 考满分老师提供。
