You have the Heebie-Geebies. Your granny sends you the recipe for the Heebie-Geebies.
We need to solve the drops in a dose.
Let's use your weight and let's assume that you weigh 125 lb.
Divide and then cancel the lb.
125 lb. / 10 lb. / drop = 12.5 drops
You will cancel the day and drops/dose will be the units we can use
12.5 drops/day / 4 doses/day = 3.125 drops/dose will be the answer
NOTE: Of course, you COULD be old school, like me, and through much use, have a bunch of conversions memorized, such as 1 mile = 5,280 feet and 1 inch = 2.54 centimeters.