What is $3 \frac{6}{7}-\frac{2}{7} ?$ Give your answer as a whole number or as a mixed number in its simplest form.

Step 1 ：Convert the mixed number to an improper fraction: \(3 \frac{6}{7} = \frac{27}{7}\)

Step 2 ：Subtract the fractions and simplify: \(\frac{27}{7} - \frac{2}{7} = \frac{25}{7}\)

Step 3 ：The final answer is: \(\boxed{3 \frac{4}{7}}\)