GWD10-19 (GWD33)

Q19:

In a certain region, the number of children who have been vaccinated against rubella is twice the number who have been vaccinated against mumps.  The number who have been vaccinated against both is twice the number who have been vaccinated only against mumps.  If 5,000 have been vaccinated against both, how many have been vaccinated only against rubella?

A.        2,500

B.         7,500

C.        10,000

D.        15,000

E.         17,500

我的答案是C。 不对吗？

正确答案无疑是D

这一期的GWD数学答案好像做的不太认真

可以看一下同一期前面那道圆心面积的题，同一道题之前出现过，但是这里答案也错了，