$$\frac{ 5 }{ } \frac{ 4 }{ 7 } \div \frac{ 13 }{ 28 }$$
$\frac{80}{13}\approx 6.153846154$
$$\frac{5\times \frac{4}{7}}{\frac{13}{28}}$$
$$\frac{\frac{5\times 4}{7}}{\frac{13}{28}}$$
$$\frac{\frac{20}{7}}{\frac{13}{28}}$$
$$\frac{20}{7}\times \frac{28}{13}$$
$$\frac{20\times 28}{7\times 13}$$
$$\frac{560}{91}$$
$$\frac{80}{13}$$
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$\frac{2 ^ {4} \cdot 5}{13} = 6\frac{2}{13} = 6.153846153846154$