1、To reproduce an old photograph,a photographer charges x do

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1、To reproduce an old photograph,a photographer charges x dollars to make a negative,3x/5 dollars for each print in excess of 10 prints,and x/5 dollars for each print in excess of 10 prints.If $45 is the total charge to make a negative and 20 prints from an old photograph.What is the value of x
A) 3 B) 3.5 C) 4 D) 4.5 E) 5

题意是:修复一张旧照片,摄影师需要做一张底片,收 x 元,洗10张以内3x/5 元一张（这是根据题意猜测的,因为in excess of 指超过多少张后,但是您的下一句还是这个词,那就只能想前一句是之内了）超过10张的每张x/5元.如果花费45元做一张底片和20张照片,x 的值是多少?
x + 10* 3x/5+10*x/5=45
x+6x+2x=45
9x=45
x=5
答案是E

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