1997 PMWC Problems/Problem T9
Problem
Find the two 10-digit numbers which become nine times as large if the order of the digits is reversed.
Solution
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Let's call any number that satisfies 
.
1. 
. It must be 
-digit, and it multiplied by nine must be -digit.
2. divides by 
. If you recall the divisibility rule of 9, the sum of digits must be divisible by 9.
3. ends in . 
must start with .
4. So 
5. 
numbers to go.
See Also
| 1997 PMWC (Problems) | ||
| Preceded by Problem T8 |
Followed by Problem T10 | |
| I: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 T: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 | ||
