One lily pad, doubling in size every day, covers a pond in 30 days. How long would it take eight lily pads to cover the pond? > A lily pad sits on a pond. It doubles in size every day. It takes 30 days for it to cover the pond. If you start with 8 lily pads instead, how many days does it take to cover the pond? I think that the answer is $27$, but I don't really think that makes sense intuitively. I think that, intuitively, the answer should be less than $30/4$ since it is increasing at an exponential rate.

Starting with 8 pcs. is like 3 days have gone by. So 27 days remain.