5 ml of content from bottle A is mixed with 5 ml of content from bottle B. The resultant mixture, when tested, detects the presence of I. If it is known that bottle A contains only P, what BEST can be concluded about the volume of I in bottle B?
Explanation:
Since impurity is detected in the final mixture, hence the mixture has at least 10% impurities.
∴ % impurity in the mixture = 5×0%+5×P%5+5 ≥ 10
⇒ 5P ≥ 100
⇒ P ≥ 20%
∴ Volume of impurities in bottle B is at least 20% of 50 ml i.e., ≥ 10 ml.
Hence, option (a).
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