某邮局现只有0.6元、0.8元、1.1元的三种面值邮票,现有邮资为7.50元

某邮局现只有0.6元、0.8元、1.1元的三种面值邮票,现有邮资为7.50元的邮件一件,为使粘贴的邮票张数最少,且资费恰为7.50元,则至少要购买______________张邮票.

答案

解析:尽量多选1.1元的邮票,若粘贴1.1元的邮票6张,邮资还差7.5-6×1.1=0.9元,还需0.6元、0.8元邮票各1张.这样情况共需8张,但这种情况总邮资超过了7.5元,所以不适应;若粘贴1.1元邮票5张,邮资还差7.5-5×1.1=2元,恰好还需0.6元邮票2张,0.8元邮票1张,共8张.适合题意.

答案:8

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