There is a 4-digit number. All the digits are different. The digit in the hundreds place is twice the digit in the ones place. The digit in the thousands place is the largest odd number. The sum of all the digits is 25. What is the number?

	Thousands	Hundreds	Tens	Ones	Total
Scenario 1	9	2	13 (✗)	1	25
Scenario 2	9	4	10 (✗)	2	25
Scenario 3	9	6	7 (✓)	3	25

Digit in the thousands place
= Largest odd number
= 9

If 1 is in the ones place and 2 is in the hundreds place
Digit in the tens place for scenario 1
= 25 - 9 - 2 - 1
= 13 (✗)

If 2 is in the ones place and 4 is in the hundreds place
Digit in the tens place for scenario 2
= 25 - 9 - 4 - 1 
= 10 (✗)

If 3 is in the ones place and 6 is in the hundreds place
Digit in the tens place for scenario 3
= 25 - 9 - 6 - 1
= 7 (✓) (Digit in the tens place must be single digit.)

Number = 9673

Answer(s): 9673