$$5/28 \times 16/55$$
$\frac{4}{77}\approx 0.051948052$
$$\frac{\frac{5\times 16}{28}}{55}$$
$$\frac{\frac{80}{28}}{55}$$
$$\frac{\frac{20}{7}}{55}$$
$$\frac{20}{7\times 55}$$
$$\frac{20}{385}$$
$$\frac{4}{77}$$
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$\frac{2 ^ {2}}{7 \cdot 11} = 0.05194805194805195$