Math Olympiad for Elementary | 2018 | Division E | Contest 3 | MOEMS | 3B

Problem: Ava’s PIN code is a 4-digit number. The sum of the four
digits is 22. Reading from left to right, the first and second
digits are the same. The second digit is twice the third digit.
The first digit is four times the fourth digit. What is Ava’s PIN
code?

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