Question

in a two digit number,the tens digit is thrice the units digit . when the digits are reversed, the number is reduced by 54.find the number

Answer 1

let the unit digit be x
then tens digit will be 3x
x(3x) - (3x)x = 54

putting x = 1
13-31 = -18

putting x= 2
26-62=36

putting x=3

39-93= 54

so the number is 39