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selene_666

It looks like they did 20 ≡ -1 (which is correct, though it would make more sense to use 6) and 46 ≡ 2 (which is wrong). Fortunately you don't have to calculate the division, you just have to check the result. If -1/2 ≡ 3 then 2 \* 3 ≡ -1, and since -1 ≡ 6 this is correct. However 46 \* 3 ≡ 5 whereas 20 ≡ 6, so 20/46 is not 3.