Mr .Lee owns a tea company and wants to make an exotic blend

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Mr .Lee owns a tea company and wants to make an exotic blend of tea .he has two brands to mix .one brand is an Indian tea that sells for $3.25 per pound .the other is a chinese tea that sells for $4.00 per pound .if he wants a mix of 35 pounds that will sell for $3.70 a pound ,how many pounds of each should he mix

题意如下：Lee先生有一家茶工厂并想要做一种外国风味的茶.他有两种茶用于混合.一种是印度茶,每磅3.25美元.另一种是中国茶,每磅4美元.如果她想要混合出35磅的茶,每磅卖3.7美元,他需要每种茶取多少磅?
解法如下：设取印度茶x磅,则中国茶是(35-x)磅
3.25*x+4*(35-x)=3.7*35
0.75x=4*35-3.7*35=0.3*35=10.5
x=3.5*4=14
因此取印度茶14磅,中国茶21磅

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