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英语翻译theare7stampswhosefacevalueis3Jiaoeachand4stampswiththefacevalueof5Jiao.howmanydifferentkindsofpostagescanbepaldbythen?(thepostageshouldbemorethanzero).看在我辛辛苦苦打字的份上,帮我翻译

题目详情
英语翻译
the are 7 stamps whose face value is 3 Jiao each and 4 stamps with the face value of 5 Jiao.how many different kinds of postages can be pald by then?(the postage should be more than zero).
看在我辛辛苦苦打字的份上,帮我翻译一下吧,最好能把这题做出来,谢谢大家了(不做也行,主要是翻译)
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答案和解析
有7张面值均为3角和4张面值为5角的邮票.用它们可以有多少种支付邮费的方式?(邮费大于0)