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Im not concerned about math problem you put up. How is this a contest if you keep changing the operation function of the equation. You could have left it the way it was. I was merely pointing out the error if there was one. But the place of the last par changes the answer i just gave yoi both. The first was a corrected answer as to the missing par. The second was after your edit. Please just pay more attention when lauching a contest with math puzzles. DONT CHANGE IT. Whether written correctly or not first correct answer to the post should win. Not the edits. Thats my only issue. Not debating about how you do it, just asking stop chaning it after we answer and upvote it.