A number of two digits is such that four times the unit digits is greater than Thrice the ten digits when the Digits are Reverse the number increase by nine
Find the number
The digits are xy. Then
10y+x = 10x+y+9
9y = 9x+9
y = x+1
so the possibilities are
89,78,67,56,45,34,23,12
Now, we also know that 4y > 3x
That doesn't help any, since we already know that 3y>3x.
I suspect a typo.