Question

The ten digit of a number is twice its unit the number obtained by the interchanging the digit is 36 less than the original number find the original number

Answer 1

2X ×10 + X = 20X+X


New

X×10 +2X=10X+2


ATQ

(20X+X) - (10X+2X) =36

Or, 9X=36
X=4
So Original number is

( 2×4×10 + 4=) 84


$84$