Math Olympiad for Elementary | 2019 | Division E | Contest 4 | MOEMS | 4B

Problem: A three digit counting number has each of the following properties:
* The three digits are in increasing order
* The sum of the digits is 9
* The number is a multiple of 15

Key: Realizing that any multiple of 5 can only have a units digit of 0 or 5

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