What is a rational number equivalent to 3.12 with a line over 12

To answer this problem, note that the line over 12 signifies that the numbers are repeating. This means that the number is 3.12121212 ...

To convert the item to a rational number, divide the repeating digits with 9. In this case, since the repeating digits are 1 and 2, divide 12 by 99. The rational number then becomes 3 12/99. Simplifying further the fraction gives 4/33. Thus, the answer is 3 4/33.