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thecostofalong--distancecalllasting4minutesand20secondswas$23.4.Atthisrate,whatwasthecostofacalllasting6minutes30seconds?yourAnsweris:$
题目详情
the cost of a long--distance call lasting 4 minutes and 20 seconds was $23.4.At this rate,what was the cost of a call lasting 6 minutes 30 seconds?your Answer is:$____
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答案和解析
设需要x美元
（4*60+20）/23.4=（6*60+30）/x；
x=35.1刀
（4*60+20）/23.4=（6*60+30）/x；
x=35.1刀
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