$$20 \times \frac{ 4 }{ 7 }$$
$\frac{80}{7}\approx 11.428571429$
$$\frac{20\times 4}{7}$$
$$\frac{80}{7}$$
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$\frac{2 ^ {4} \cdot 5}{7} = 11\frac{3}{7} = 11.428571428571429$
