Let's continue the series of interesting logic puzzles, the questions are now more difficult. It will make you think longer. In case of an incorrect answer, there will be a chance to think again and even get a hint if necessary. Try to find patterns using the most basic mathematical rules. There are no tricks here, only the search for the right logic. After your answer, you will see the solution with an explanation. The third part is a difficult brain teaser, but very useful for you.