Hmm. This means to represent \(\dfrac{28}{5 \frac{5}{6}}\) as a fraction. We could turn them both into improper fractions:
\(28 = \frac{168}{6}\)
\(5 \frac{5}{6} = \frac{35}{6}\)
Dividing \(28\) by \(5 \frac{5}{6}\):
\(\frac{168}{6} \div \frac{35}{6}\)
When dividing one fraction by the other, you simply multiply by the right fraction's reciprocal:
\(\frac{168}{6} \div \frac{35}{6} = \frac{168}{6} \cdot \frac{6}{35}\)
So we just have to multiply these fractions. What do you get? :D