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. Determine 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?

A. tu = ut + 18
B. 9u - 9t = 18
C. 9t - 9u = 18

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