-1
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This question already has an answer here:

It seems kids can resolve this puzzle faster than developers

So, can you solve this puzzle ?


| 8809 = 6 | 5555 = 0 | 7111 = 0 |

| 8193 = 3 | 2172 = 0 | 8096 = 5 |

| 6666 = 4 | 1012 = 1 | 1111 = 0 |

| 7777 = 0 | 3213 = 0 | 9999 = 4 |

| 7662 = 2 | 7756 = 1 | 9313 = 1 |

| 6855 = 3 | 0000 = 4 | 9881 = 5 |

| 2222 = 0 | 5331 = 0 | 3333 = 0 |


What is the answer to 2581 = ?

I do not have any merit on this one since I didn't create it. I just found it sympathic to share. Have fun !

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marked as duplicate by Gareth McCaughan Dec 12 '18 at 11:18

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

7
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The answer is:

2

Explanation:

The result is the number of "holes" in the digits that form each number.

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