If the volume of 100 liquid drops is 0.1 fluid ounce, what is the volume of 10 drops?

To do this, you need to set up a proportion. 100 drops= 0.1 fl oz, and so you are looking for 10 = x fl oz., where x equals the amount of fluid ounces 10 drops equals

 0.1   =  x
100      10

When you cross-multiply, this becomes (0.1)(10) = 100x
0.1 times 100 equals 1, so it becomes 1 = 100x
To get x by itself, divide both sides by 100, and you get x = 0.01 fluid ounces