Question

A number consist of 2 digits. Sum of the did it is 9. If 9 is subtracted from the numbers, the digits are reversed. Find the s of the number.

Answer 1

4 and 5 are digits. 45 and 54 are numbers, which has difference of 9. Formula is: if number is ab and the other number is ba, then the difference is 9(a-b).