A child requires a 5ml dose of medicine each day. how many days would a gallon of this medicine last.

in a US gallon, there are approximately 3.79 Liters, in a Liter there are 1000 milliLiters, so 3.79 Liters is then 3.79 * 1000 milliLiters, namely 3790 milliliters.

since a gallon is then approximately 3790 mL, how many times does 5mL go in to 3790? 3790 : 5 = 758.

since the child uses 5mL in 1 day, then 758 times that is 758 days.