1.(DS)问the hundredths digit of the decimal Z? (1)The tenths digit of 100Z is 2 (2)The units digit of 1000Z is 2 这道题倒是做对了,但我没搞明白这里的hundredths 是指小数点后2位也就是百分之一么?那下面的tenths应该是十位数对吧?但也可以是10分之一不是么?这个如何来区分呢?
3.A contrator combined x tons of a gravel mixture that contained 10 percent gravel G, by weight, with y tons of a mixture that contained 2 percent gravel G, by weight, to produce z tons of a mixture that was 5 percent gravel G by weight. What is the value of x (1)y=10 (2)z=16 (答案是D)