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My bad, answer is 35

Where do you get 3, 13 and 24 from? Did you read the terms and conditions? You're supposed to find the answer by simply replacing the plus signs with either a plus or minus or divide or multiply and perhaps adding brackets to make sense of the precedence!

I missed that part, I thought It was just a pattern finding problem

That's okay! I wish you'd left the comment unedited for others to see. I still haven't figured out how I should treat those who leave two comments/answers. I have to think up of something and add it to the rules section! :]