The sum of the digits in a two digit number is 12. Of the tens digit is 3 times the ones' digit,what is the number?

SOURCE: this mystery number has 4

The preceding describes six decimal numbers:
3517
3715
5317
5713
7315
7513
The largest of these is 7513 .

SOURCE: this mystery number has 4 digits.every digit is an

Odd numbers 1, 3, 5, 7
Uses all 4
1 is in the 10's place
7513 is the largest number that can be created
This is answer based on the provided information.

SOURCE: What is the answer of

There are two possible answers to the above question, 4136 and 7348.
4136
My ones is twice my tens: The 6 (the ones) is twice as big as the 3 (the tens).
My hundreds is five less than my ones: 6 (the one) - 5 = 1
My thousands place is the sum of my tens and hundreds: 3 (the tens) + 1 (the hundreds) = 4