The sum of the two digits of a number is 16. The number formed by reversing the digits is 18 more than the original number. Dete
rmine the original number. Let t = the tens digit, u = the units digit, and u + t = 16. Which of the following equations would complete the system? 9t - 9u = 18 9u - 9t = 18 tu = ut + 18
