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1 . A two-digit number becomes five-sixth of itself when its digits are reversed. Two digits differ by one. The number is :

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Answer: Option B

Explanation:

Hints: When the digits are reversed, the number become 5/6 th of itself, lesser. So the units place digit is smaller.

Let, units place digit is x, so 10th place is x + 1, as the two digits differ by 1.

5/6 { 10(x + 1) + x} = 10x + x + 1

5 (11x + 10) = 6(11x + 1)

55x + 50 = 66x + 6

11x = 44

x = 4

The number is = 10(4 + 1) = 10×5 + 4 = 54