If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 36. By how much do the two digits differ?  Choices
A) 3 B) 4 C) 5 D) 6 E) 7
Given that (10a + b) - (10b + a) = 36 --&gt; 9a - 9b =36 --&gt; a - b 36 --  9  - 9= 
<gadget id="calculator">36 --  9  - 9</gadget>
<output>36</output>
36 --&gt; a - b= 4.   Answer: 4.
<result>B</result>
If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 36. By how much do the two digits differ?