Alexander B. answered • 09/11/15

PhD in Engineering with 20 yrs of Math and Science Teaching Experience

Assume a surface area of the water lily is S, lake surface area L, the key equations is:

**S(2**

^{30})=L/2multiplying by 2:

**S(2x2**

^{30})=L, or S(2^{31})=Lthus it will take 31 days and 2

^{31}lilies to cover the entire lake.