The average of the two-digit numbers, which remain the same when the dibits inter-change their positions, is
Answers:
A) 23 B) 39 C) 55 D) 28 E) 01
Explanation:   Average = (11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99) / 9   =( (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 55) / 9   = (4 * 110 + 55)/9 = 495 / 9= 
<gadget id="calculator">495 / 9</gadget>
<output>55</output>
55.   Answer: 55
<result>C</result>
The average of the two-digit numbers, which remain the same when the dibits inter-change their positions, is