李想和张名集邮,李想集的张数是张名的2.5倍,张名再集30张就和李想同样多,两人原来各有多少张邮票?(算式)

吕美凤2022-10-04 11:39:542条回答

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一只背着壳的蜗牛 共回答了15个问题 | 采纳率80%
一、设李想有X张,张名有Y张,则:X=2.5Y,Y+30=X,解得:X=50,Y=20.
二、李想集的张数是张名的2.5倍,说明李想的张数比张名多1.5倍,而张名再集30张就和李想同样多,说明这30张就是李想比张名多的1.5倍张数,所以30÷(2.5-1)=20就是张名原来的邮票张数,因此李想的张数是20+30=50.
1年前
icy_414 共回答了10个问题 | 采纳率
张名30/(2.5-1)=20
李想20+30=50
1年前

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