If `1957-a9=18b8` Then the sum of the digits a and b is

The difference of the digits of a two digit number is 8. Then the sum of the digits is

If the number obtained on the interchanging the digits of two-digit number is 18 more than the original number and the sum of the digits is 8, then what is the Reversed number?

If the number obtained by interchanging the digits of a two digit number is 18 more than the original number and the sum of the digits is 8 then what is the original number?

In a two-digit number, the sum of the digits is 9. If 9 is subtracted from the number, then the digits get reversed. Find the product of the digits

A book contains 1000 pages numbered consecutively. The probability that the sum of the digits of the number of a page is 9, is a/b, then a xx b =