GERBU H I HAVE WATCHED EVERYTHING EVERYONE HAS EVERY SAID H (AKA STALKER)

An item not normally included in ansi recommendations, but recommended by other groups is: a) a syringe b) a blood pressure monitor c) a defibrillator d) all of the above

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How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?