The average of the two-digit numbers, which remain the same when the digits int

Question

The average of the two-digit numbers, which remain the same when the digits interchange their positions, is:

Options:

A . 33

B . 44

C . 55

D . 66

Answer: Option C

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 = 55.

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