菜鸟求助!!= =

cz900509

有道Data Suffciency题看不太懂，不知道具体问的什么。求助！下面是题目If the length of Wanda's telephone call was rounded up to the nearest whole minute by her telephone company,then Wanda was charged for how many minutes for her telephone call?
1)The total charge for Wanda's telephone call was ＄6.50
2)Wanda was charged ＄0.50 more for the first minute of the telephone call than for each minute after the first
12版0G 56页27题 我看了解释还有点模糊= =水平太菜 只求翻译下题干 = =

wyw1018

设第一分钟收费x$,收费时间y分钟
由1）2）可得6.5=x*1+(x-0.5)*(y-1) 无法求出y