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In this type of puzzle: swap two pairs of digits to make the addition correct. For example, in the illustration above the 7 and the adjacent 0 might have been swapped, or the 3 with one of the 8’s. Your task of course is to restore the original correct sum by finding the two swaps.
1) nr 1*
1486
3172
—-+
7313
2) nr 2*
3155
4349
—-+
7317
3) nr 3*
2748
6146
—-+
6134
4) nr 4*
9559
1326
—-+
5418
5) nr 5*
See the illustration at the top of this post.
Nr 3 comes from Issue no 41, 1975, of the famous British magazin Games and Puzzles. I suppose an anonymous editor came up with this puzzle type.
If you have other information about the origin of this puzzle type, I’d love to hear it.
You can find the solutions at 137, 147, 157, 167 and 177
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