$$\frac{69}{108}\times20$$
$\frac{115}{9}\approx 12.777777778$
$$\frac{23}{36}\times 20$$
$$\frac{23\times 20}{36}$$
$$\frac{460}{36}$$
$$\frac{115}{9}$$
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$\frac{5 \cdot 23}{3 ^ {2}} = 12\frac{7}{9} = 12.777777777777779$