Saw this on Facebook.

First off, no peeking at the answer right away. 

As the story goes:

This problem was given to a group of 5 and 6 year olds in Nagoya, Japan, for admission to a kindergarten for gifted children.  74% of the children solved it.

3213 = 0
1111 = 0
7111 = 0
2172 = 0
6666 = 4
7662 = 2
9312 = 1
0000 = 4
2222 = 0
5555 = 0
8193 = 3
8096 = 5
7777 = 0
7756 = 1
7777 = 0
6855 = 3
9999 = 4
9881 = 5
5531 = 0

So, with all those clues:

6782 = ???

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• Answer by RR