GMAT Problem of the Week. Issue#9

The number of water lilies on a certain lake doubles every two days. If there is exactly one water lily on the lake, it takes 60 days for the casino online lake to be fully covered with water lilies. In how many days will the lake be fully covered with lilies, if initially there were two water lilies on it?

(A) 15

(B) 28

(C) 30

(D) 58

(E) 59

11 thoughts on “GMAT Problem of the Week. Issue#9

  1. Guys, thanks for your thoughts! The correct answer is D. If there were two lilies originally, then they would need to double one time less than if we started from one flower only. As they double every two days, our answer is 60 – 2 = 58.

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