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IT WILL TAKE 29 DAYS FOR TWO WATER LILIES TO COVER THE WHOLE POND. EACH WATER LILY WILL NEED TO COVER HALF OF THE POND. THE WATER LILIES WILL COVER HALF OF THE POND ON THE 29TH DAY 28 DAYS. UNTIL THE 27TH NIGHT, THE FROG WOULD HAVE MANAGED TO SCALE A HEIGHT OF 1 METER PER DAY OR 27 METER IN TOTAL. ON THE 28TH DAY, HE WOULD HAVE CLIMBED 3 METERS DURING THE DAY THEREBY COMPLETING HIS TASK 9 DAYS TO FILL 1/2 AND 8 DAYS TO FILL 1/4 OF THE TANK. IF THE CREATURE FILLS THE TANK IN 10 DAYS AND IT DOUBLES EVERY DAY, ON THE NINTH DAY IT WOULD FILL 1/2 THE TANK. THUS ON THE 8TH DAY IT WILL FILL 1/4 OF TANK IT WOULD TAKE 47 DAYS TO COVER HALF OF THE LAKE, AS THEY DOUBLE IN SIZE EVERY DAY