The sum of the digits of a two-digit positive number is 9. When the digits of the number are interchanged, the number thus formed is. less than thrice
the original number, by 9. What is twice the original number ?
Gayathri since the newly formed number is 3x-9, it is less than 45
And sum of digits is 9 so it can be 18, 27, 36, 45
Now trail and error gives 27 as the answer.