IN A 2DIGIT NO., TEN'S DIGIT IS TWICE THE UNIT'S DIGITS. THE NO. FORMED BY INTERCHAMGING THE DIGITS IS 36 LESS THAN THE ORIGINAL NO.. THE NO. IS.............?

Manish Bharti , Meritnation Expert added an answer, on 21/12/12

Let the unit digit be x.

then, the ten 's digit is 2x

and the number is

By interchanging the digits, 10 's digit becomes x and unit digit becomes 2x

New number

According to the question,

Therefore, the number is 84

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