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MGSM / Shawnda 决定她所在街区的孩子们可以真的使用自行车轮胎打气服务。她决定最佳收费方式是按轮胎收费。每个轮胎打气的费用是 25 美分。第一天,5 个人骑着双轮…

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Shawnda 决定她所在街区的孩子们可以真的使用自行车轮胎打气服务。她决定最佳收费方式是按轮胎收费。每个轮胎打气的费用是 25 美分。第一天,5 个人骑着双轮自行车过来给每个轮胎打气。3 个人过来给全部三轮自行车的轮胎打气。最后,一个人实际上是骑着单轮自行车过来的。她那天赚了多少美元?

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