After exchanging the position of a two digit digit digit with the digit on the ten digit, a new two digit is obtained, which is equal to four seventh of the original two digit, Find the original two digits. If there are more than two two digits, what is the sum of these two digits

After exchanging the position of a two digit digit digit with the digit on the ten digit, a new two digit is obtained, which is equal to four seventh of the original two digit, Find the original two digits. If there are more than two two digits, what is the sum of these two digits

Let the single digit number be x and the ten digit number be y, then the original two digit number is 10Y + X, and the new number after the digit exchange position is 10x + y10x + Y / 10Y + x = 4 / 7. Solve the equation 2x = y, y = 2 when x = 1, y = 4 when x = 2, y = 4 when x = 2, y = 6 when x = 3, y = 8 when x = 4, y = 8 when x = 4