The Demonic Vines
There are vines that are growing on the florist's house. The florist then researches what the vines are, and finds out that they double their size every minute. But, all is not lost, the vines could be removed with a chemical when it it exactly half its full size, and it just so happens that the florist's house is exactly the same size as the full size of the vine. If the vines can devour the whole house in 30 minutes, when should the florist use the chemical and kill it?
Answer in number of minutes.
The answer is 29.
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1 solution
It takes one minute to double its size so one minute before thirty minutes which is twenty nine minutes is the time it takes to fill half the house