SOLUTION: It takes 40 days for a pond to get filled with rain water. If the level of water doubles each day, then how long would it take to fill 1/4 of the pond? (A) 10 days (B) 20 da

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: It takes 40 days for a pond to get filled with rain water. If the level of water doubles each day, then how long would it take to fill 1/4 of the pond? (A) 10 days (B) 20 da      Log On


   

Question 224531: It takes 40 days for a pond to get filled with rain water. If the level of water doubles each day, then how long would it take to fill 1/4 of the pond?
(A) 10 days (B) 20 days (C) 30 days (D) 35 days (E) 38 days
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
This is a NEAT problem. I'm going to say 38 days, because if the pond is 1/4 filled on day 38, then it doubles and becomes half full on day 39, then it doubles again and becomes full on day 40.

Again, congratulation on a REALLY neat problem!!

R^2

Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus