Question

Sum of digit of 2 digit no. 17 .on the revising the digit the new no. is 9.more than the original number.Find the no. ​

Answer 1

Answer:

9

Step-by-step explanation:

digit at ten - x unit-y original number 10x+y interchange 10y+x x+y=17....1 10x+y+9=10y+x 9x-9y=-9 x-y= -1 ....2 divided both sides with 9