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I just came across a maths puzzle,where i should get the sum of 9 numbers(multiples of 10) to be 450 both horizontally and vertically in a 9x9 matrix.

Picture attached for reference:

enter image description here

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  • $\begingroup$ So, basically a magic sudoku. $\endgroup$ – feelinferrety Aug 4 '17 at 20:52
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    $\begingroup$ Can you post a CSV for ease of solving? (P.S. since ~everything~ is divisible by 10, all the 0s are completely unnecessary.) $\endgroup$ – feelinferrety Aug 4 '17 at 20:53
  • $\begingroup$ Why not skip the tens? $\endgroup$ – paparazzo Aug 4 '17 at 22:13
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There are actually lots of solution to this problem. Here is an example:

enter image description here

I did remove $10$ times from the table to show it more clear. But if you ask me how I solved it;

I just put numbers from 9 to 1 in the matrix one by one, for example I have started putting the number from 9 as below:

enter image description here

The location chosen according to the idea of the puzzle, yellow area shows where you cannot put the 9s. the green area is the safe places where you can put 9s but they should not be on the same row and column as shown in the graph above.

The rest is just trial and error with the same methodology explained here.

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  • $\begingroup$ thank you!!!! I just thought there would be some specific logic behind this puzzle...it was just a shoot in the dark ...great that worked... $\endgroup$ – l.lijith Aug 5 '17 at 5:40
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Here is one possible solution:

enter image description here

My strategy was the good ol' fashioned brute force approach.

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