medium · GMAT Quant
A researcher is auditing a batch of 60 experimental vials. 30 vials are labeled Group A and 30 are labeled Group B. Within Group A, 6 vials contain a high-concentration solution. Within Group B, 12 vials contain a high-concentration solution.
If a vial is selected at random from the batch and is found to be a Group A vial, what is the probability that it contains a high-concentration solution?
- dfrac15
- dfrac110
- dfrac310
- dfrac45
- dfrac12
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