Ella writes a number on the card. It is greater than 300 but smaller that 330. The sum of all digits is 7. How many possible numbers are there?
The digit in the hundred place is 3.
Sum of the digit in the tens place and the ones place
= 7 - 3
= 4
Hundreds |
Tens |
Ones |
3 |
0 |
4 |
3 |
1 |
3 |
3 |
2 |
2 |
The possible numbers are 304, 313 and 322.
Number of possible numbers: 3
Answer(s): 3