No.131 Two-Digit Number
Example
A two-digit integer has digits whose sum is 11. Reversing the digits makes a number 27 greater than the original. Find the original integer.
POINT
If the tens digit is x and the ones digit is y, a two-digit integer is 10x+y.
47
Practice
Practice 1
The digits sum to 9. Reversing them makes a number 27 less than the original. Find the original integer.
63
Practice 2
The digits sum to 10. Reversing them makes a number 36 greater than the original. Find the original integer.
37