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In a certain region, the number of children who have been

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Intern
Joined: 15 Oct 2007
Posts: 13
In a certain region, the number of children who have been  [#permalink]

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15 Oct 2007, 21:30
1
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

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Director
Joined: 09 Jul 2007
Posts: 917
Location: London

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15 Oct 2007, 21:41
1
mistahfold wrote:
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

R=2M
R&M=2M only

R&M=5000

only M=2500
M=7500

as R=2M so R=15000
then R only=15000-5000=10000

C
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Joined: 09 Sep 2013
Posts: 13271
Re: In a certain region, the number of children who have been  [#permalink]

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31 Oct 2018, 14:14
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Re: In a certain region, the number of children who have been   [#permalink] 31 Oct 2018, 14:14
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