5•4 /8

Let's simplify the expression step by step:

First, calculate \( 5 \times 4 \): \[ 5 \times 4 = 20 \]

Then, divide by 8: \[ \frac{20}{8} = \frac{20 \div 4}{8 \div 4} = \frac{5}{2} \]

Final answer: \[ \frac{5}{2} \quad \text{or} \quad 2.5 \]