1. The sum of the digits of a two-digit no. is 15. the number obtained by interchanging its digits exceeds the given number by 9. Find the original number.
2. The difference between a 2 digit no. and the no. obtained by interchanging its digits is 63. What is the difference between the digits of the no. ?
3. in a3-digit number, the tens digit is thrice the units digit and the hundreds digit is four times the units digit. Also, the sum of its digits is 16. Find the number