In this case, as bucket content aproaches 0 drops, 1 drop becomes infinitely more, at least in calculus.

Limits in calculus: "When a real function can be expressed as a fraction whose denominator tends to zero, the output of the function becomes arbitrarily large, and is said to "tend to infinity" For example, the reciprocal function, f ( x ) = 1/x tends to infinity as x tends to 0.

Source: https://en.m.wikipedia.org/wiki/Division_by_zero