英语翻译The selling prices of a postcard and a stamp are $6 and

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英语翻译
The selling prices of a postcard and a stamp are $6 and 1.4 respetively.Mandy paid $95 for 2x postcard and 5x stamps .Find the total number of stamps.

贺卡和邮票的销售价格分别是每张6美元和1.4美元.
mandy 花了95美元买了2x张贺卡和5x张邮票. 计算邮票的张数.
6个2x=12x, 1.4×5x=7x
12x+7x=19x
95÷19=5

5×15=75 张

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