If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 54. By how much do the two digits differ?
Choose the correct choice from the following answers:
A) 3  B) 4  C) 5  D) 6  E) 7
Given that (10a + b) - (10b + a) = 54 --&gt; 9a - 9b =54 --&gt; a - b 54 --  9  - 9= 
<gadget id="calculator">54 --  9  - 9</gadget>
<output>54</output>
54 --&gt; a - b= 6.   Answer: 6.
<result>D</result>
If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 54. By how much do the two digits differ?