$$\frac{7}{36}+\frac{1}{18}\div\frac{4}{27}=$$
$\frac{41}{72}\approx 0.569444444$
$$\frac{7}{36}+\frac{1}{18}\times \frac{27}{4}$$
$$\frac{7}{36}+\frac{1\times 27}{18\times 4}$$
$$\frac{7}{36}+\frac{27}{72}$$
$$\frac{7}{36}+\frac{3}{8}$$
$$\frac{14}{72}+\frac{27}{72}$$
$$\frac{14+27}{72}$$
$$\frac{41}{72}$$
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$\frac{41}{2 ^ {3} \cdot 3 ^ {2}} = 0.5694444444444444$