Three digit number:
ABC
"if the digits are reversed, the number is unchanged":
A=C, so our number is ABA
"the sum of the digits is 14":
A + B + A = 14 or 2A + B = 14
"the tens digit is two more than the ones digit":
B = A + 2
We have two equations:
2A + B = 14
B = A + 2
Using substitution, we have:
2A + A+2 = 14
3A + 2 = 14
3A = 12
A = 4
Going back to B = A + 2:
B = 4 + 2
B = 6
The number, ABA is 464.