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Question 749500: • My tens and ones digits are both odd; my ones digit is 300% of my tens digit.
• The sum of my thousands and hundreds digits is equal to my ones digit.
• The sum of all of my digits is 21.
Answer by timvanswearingen(106)   (Show Source):
You can put this solution on YOUR website! You have two choices for the tens and ones digits, respectively.
The number will be xx13 or xx39, the sum of the first two digits is the same as the last, and the sum of all four is 21. If the sum of the first two digits was 3, the sum of all four would only be 7. If the sum of the first two digits is 9, then 9+3+9=21. Therefore the number is of the form xx39 where the first two digits add up to 9.
9039
1839
8139
2739
7239
3639
6339
4539
5439
Those would all work
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