Assuming that there are 20. drops in 1.0 mL, how many drops are in 4.0 gallons?
It is known that there are 3785.41178 ml in one gallon. So, in 4 gallons there are 4×3785.41178=15141.6471 ml. If there are 20 drops in one ml: 20×15141.6471=302832.942=302832 full drops in one gallon.
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