number: 10x + 30 + x

reversed : 10x + x + 3

10x+ 30 + x - 10x - x -3 = 27

0x = 0

in this case, x would be all the positive real values but check the equation by substituting values.

x = 1 (possible)

x = 2 (possible)

x = 3 (possible)

x = 4 (possible)

x = 5 (possible)

x = 6 (possible)

x = 7 (rejected since it gives a three digit number)

so x = + {1,2,3,4,5,6}