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Sep 6, 2018 at 10:58 history edited JMP CC BY-SA 4.0
english and grammar
Sep 6, 2018 at 9:52 comment added Oray @lovemathboy I gave my solution here since no other good solution exists here and accepted it. I think it was kinda hard :(
Sep 6, 2018 at 9:51 vote accept Oray
Sep 6, 2018 at 9:51 history edited Oray CC BY-SA 4.0
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Sep 6, 2018 at 9:26 comment added Luis Sousa you can only swap each square once for the optimal clear solution @lovemathboy
Sep 6, 2018 at 8:54 comment added lovemathboy Hopefully the new solution I found was your intended answer @Oray :)
Sep 6, 2018 at 8:51 history edited lovemathboy CC BY-SA 4.0
added 469 characters in body
Sep 6, 2018 at 8:06 comment added nickgard According to a comment on the OP, evaluation should be left to right, which would give $27-3\times9=216$. FWIW, I'd prefer usual operator precedence in any arithmetic puzzle.
Sep 6, 2018 at 5:21 comment added Oray @Quintec originally i was not planning to accept 0( concept then i thought it would be okay :)
Sep 6, 2018 at 2:02 comment added Quintec @Oray what do you mean by "no trick"? this answer fits all the rules, does it not?
Sep 5, 2018 at 21:15 comment added Oray this is good one, but not my intended answer and 4 is actually optimal though actual answer does not require any trick.
Sep 5, 2018 at 16:33 history answered lovemathboy CC BY-SA 4.0