Here are the answers and Cheats to Escape Room: Math Doors Door 67. If you need help with other levels check our Escape Room Math Doors Page.
Hint – You know the first digit, its easy to find the 2nd digit and 3rd digit will be the substraction.
Solution – 263 First digit is 2 as number is between 256-299. 2nd digit is is even so 6 and 3rd digit 11-6-2=3