If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 18. By how much do the two digits differ?
Answers.
A) 2
B) 4
C) 5
D) 6
E) 7
Given that (10a + b) - (10b + a) = 18 --&gt; 9a - 9b =18 --&gt; a - b 18 --  9  - 9= 
<gadget id="calculator">18 --  9  - 9</gadget>
<output>18</output>
18 --&gt; a - b= 2.   2nswer: 2.
<result>A</result>
If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 18. By how much do the two digits differ?