涛涛GWD26-17

mayce

Q17:

A doctor prescribed 18 cubic centimeters of a certain drug to a patient whose body weight was 120 pounds.  If the typical dosage is 2 cubic centimeters per 15 pounds of body weight, by what percent was the prescribed dosage greater than the typical dosage?

 

 

A.    8

B.    9

C.    11

D.    12.5

E.    14.8

Answer: D

我怎么算不出来呢？

[此贴子已经被作者于2006-8-27 15:18:33编辑过]

diamondivy

the typical dosage is 2 cubic centimeters per 15 pounds of body weight
        

 typical的情况
            每15 pounds 可以
        有
             2 cubic centimeters 的
        dosage

 所以原本
            120 pounds 的病人，

 应该要用
        (150/12) * 2 =16 cubic centimeters 的
        dosage

 但医生开了
             18 cubic centimeters，

 因此比原来多了
             ( 18-16 ) / 16 = 0.125 => 12.5%
        

mayce

理解了 谢谢啊！