$$2 \times \frac{ 22 }{ 7 } \times \frac{ 28 }{ 9 }$$
$\frac{176}{9}\approx 19.555555556$
$$\frac{2\times 22}{7}\times \frac{28}{9}$$
$$\frac{44}{7}\times \frac{28}{9}$$
$$\frac{44\times 28}{7\times 9}$$
$$\frac{1232}{63}$$
$$\frac{176}{9}$$
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$\frac{2 ^ {4} \cdot 11}{3 ^ {2}} = 19\frac{5}{9} = 19.555555555555557$
