Aaron writes a number on the card. It is greater than 500 but smaller that 530. The sum of all digits is 9. How many possible numbers are there?
The digit in the hundred place is 5.
Sum of the digit in the tens place and the ones place
= 9 - 5
= 4
Hundreds |
Tens |
Ones |
5 |
0 |
4 |
5 |
1 |
3 |
5 |
2 |
2 |
The possible numbers are 504, 513 and 522.
Number of possible numbers: 3
Answer(s): 3