Practice Test Discussion

Q)

The difference between a two digit and the number obtained by interchanging the positions of its digit is 36. What is the difference between the two digit number?

    • Explanation

    Let the ten's digit be 'x' and unit's digit be 'y'

    Then, (10x+y)-(10y+x)=36

    ⇒ 9(x-y)=36

    ⇒ x-y=4

    Hence, Option A is correct.

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