Practice question
Question
The blood volume of an individual is 5 litres. The person was injected with 500 mg of a drug that has molecular weight of 100 Da. If the drug is metabolized so that half of the drug remains in the bloodstream after every passing hour, the concentration of the drug four hours after injection is:
Explanation
The principle of quantitative reasoning explains that ratio, percentage and series logic determine correct calculation. Hence 0.0625 mM, fits best because it meets mathematical and logical criteria, as documented in authoritative sources on aptitude and reasoning.
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