The average of then tw

Question

The average of then two-digit numbers , which remain the same when the digits inter -change 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)]`

= `((4xx 110 + 55)/(9))` = ` 495/9` = 55.

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