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# A group of people were administered two kinds of vaccines, R

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Director
Joined: 25 Oct 2006
Posts: 652
Followers: 9

Kudos [?]: 240 [0], given: 6

A group of people were administered two kinds of vaccines, R [#permalink]  02 Jun 2007, 17:26
A group of people were administered two kinds of vaccines, R and M. Twice as many people received both vaccines as received M only. Twice as many people received R as received M. If 5,000 people received both R and M, how many people received only R?
CEO
Joined: 17 May 2007
Posts: 2994
Followers: 59

Kudos [?]: 470 [0], given: 210

I come up with 10,000 is this the OA ?

I drew a Venn diagram, Both R & M = 5000
Only M is 1/2 of Both R & M = 2500

Total number of M is 7500
Total number of R is double of M = 15000

Now we can subtract 5000 from 15000 and get 10,000
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