<h1>4keys-4locks logic puzzle</h1>

 A logical mathematical puzzle to practice your logical reasoning skills.

Brain teasers and puzzles
 for children-for teens-for adults

With solutions


There are 4 keys and 4 locks. What is the maximum number of times you need to try the locks so as to match all 4 keys to their locks?

    A. 4
    B. 6
    C. 10
    D. 16


Use reasoning skills to solve this logical puzzle.

 Below you can see the correct answer and the detailed explanation

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If you try 3 keys on the 1st lock, you will know that the 4th key is a match. So, you only need a maximum of 3 tries. Similarly, the 2nd lock needs a maximum of 2 tries and the 3rd lock needs only 1 try. Thus, 3 + 2 + 1 = 6 tries are needed.