Answer:
If the 2 digit no is 10x + y ,
the number with reverses digits will be 10y + x
The difference between them is 18. So,
10x +y -10y -x = 18. So
9x - 9y = 18. So
x-y= 2
Which means the set of two digit numbers whose difference in digits is 2 will be the solution.
These numbers are
13 , 31
24,42
35, 53
46, 64
57, 75
68, 86
79, 97
So such pairs are 7
Step-by-step explanation:
