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题库 / GMATLA-PS-202
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?
2,500
7,500
10,000
15,000
17,500
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没看清楚最后问的是哪一类人（不是人的总数！）
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