ABC is a 3-digit number and A - C = 2. The difference beween ABC and the number obtained by reversing its digits is ______.
The 3-digit number ABC can be written as 100A + 10B + C.
Similarly, CBA can be written as 100C + 10B + A.
Difference
= (100A + 10B + C) - (100C + 10B + A)
= 100A + 10B + C - 100C - 10B - A
= 99 (A - C)
It is given that A - C = 2.
Therefore, difference = 99 × 2 = 198.