There is a chocolate bar which is cracked into 25 pieces in total with the length and width on five lines.
How many times must I crack it at least number of times to divide this chocolate bar into 25 pieces without cracking in piles?
Answer
24 times
Solution
If it is divided once without piling up, only one piece will increase in number.
Since at first there is big one piece which is to be divided into 25 little pieces in the end, it will be divided 24 times.
How to divide is not related.
