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.............?
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
According to the question,
Therefore, the number is 84
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Let the unit digit be x. So the ten 's digit is 2x
The value of the number is 10*2x + x = 20x + x = 21x
By interchanging the digits, 10 's digit is x and unit digit is 2x
New value = 10*x + 2x = 12x
Original value - new value = 21x - 12 x = 9x
But it is given that the difference is 36
so 9x = 36
x = 36/9 = 4
2x = 8
so the number is 84
[check answer: 84 - 48 = 36; so ok]
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