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0 / 60 seg.
Lily is a lilypad in a small pond. Lilly doubles her size each day, On the 20th day she covers the whole pond. On what day was Lily half the size of the pond?
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Clue
THE JAR WILL BE HALF FULL IN 59 MINUTES. A MINUTE LATER, IT WILL DOUBLE AND WILL FILL THE JAR
IT WILL TAKE 198 DAYS. LET'S SAY THE TREE WAS ORIGINALLY ONE FOOT TALL. ON THE FIRST DAY, IT GREW HALF A FOOT; ON THE NEXT DAY 1⁄3 OF 11⁄2 FEET, WHICH IS HALF A FOOT; AND SO ON - IT GREW HALF A FOOT EVERY DAY. SO IN 198 DAYS, IT GREW 99 FEET, AND THEN WAS 100 FEET TALL
DAY 19, IT'S NOT 10 BECAUSE ON DAY 20 SHE DOUBLED FROM DAY 19, SO 19 MUST BE HALF THE SIZE OF THE POND
IT WOULD TAKE 47 DAYS TO COVER HALF OF THE LAKE, AS THEY DOUBLE IN SIZE EVERY DAY
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