If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 63. By how much do the two digits differ?  Pick one:	A) 3	B) 4	C) 5	D) 6	E) 7
Given that (10a + b) - (10b + a) = 63 --&gt; 9a - 9b =63 --&gt; a - b 63 --  9  - 9= 
<gadget id="calculator">63 --  9  - 9</gadget>
<output>63</output>
63 --&gt; a - b= 7.   Answer: 7.
<result>E</result>
If a two-digit positive integer has its digits reversed, the resulting integer differs from the original by 63. By how much do the two digits differ?