GMAT Problem Solving
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Source: PREP
Level: 0
A flower arrangement consists of 30 roses, each of which is either white or red. If a rose is to be selected at random from the flower arrangement, the probability that the rose selected will be white is twice the probability that it will be red. How many white roses are in the flower arrangement?
- A 5
- B 10
- C 15
- D 20
- E 25