2021 JMPSC Sprint Problems/Problem 5
What two-digit even number has digits that sum to ?
There exists a digit even number that has digits that sum to . Pertaining to the assumption that this operation is in base , there exists only digits to be used, specifically only for the first digit. Only and may be used, as there isn't other pair of digits which sum to
The only two numbers in which satisfy the fact that the digits sum to are and . Yet, only works because it is the only one in which satisfies the condition that the number must be even.
Therefore, is the only two-digit even number that has digits that sum to .