12 - 2 3/5

Let's calculate the difference. First, convert the mixed number to an improper fraction:
$$2 \frac{3}{5} = \frac{2 \times 5 + 3}{5} = \frac{10 + 3}{5} = \frac{13}{5}$$
Now subtract:
$$12 - \frac{13}{5} = \frac{12 \times 5}{5} - \frac{13}{5} = \frac{60}{5} - \frac{13}{5} = \frac{60 - 13}{5} = \frac{47}{5}$$
Convert the improper fraction back to a mixed number:
$$\frac{47}{5} = 9 \frac{2}{5}$$
Answer: 9 2/5 or 9.4