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Mystery Matrix (Posted on 2013-07-04) Difficulty: 3 of 5
5 3 7 8 9
2 6 4 1 x
8 0 2 0 4

What is x?

No Solution Yet Submitted by Danish Ahmed Khan    
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Solution could be... | Comment 1 of 6

In each column, the bottom digit is the sum of the top two digits plus 1, mod 10; in other words, that sum's units digit:

5+2+1=8
3+6+1=10 = 0 mod 10
7+4+1=12 = 2 mod 10
8+1+1=10 = 0 mod 10

then

9+4+1=14 = 4 mod 10

so the middle 4 in this sum should be the x.


  Posted by Charlie on 2013-07-04 12:45:20
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