$$15 \frac { 5 } { 6 } 3 \frac { 1 } { 3 }$$
$\frac{475}{9}\approx 52.777777778$
$$\frac{90+5}{6}\times \frac{3\times 3+1}{3}$$
$$\frac{95}{6}\times \frac{3\times 3+1}{3}$$
$$\frac{95}{6}\times \frac{9+1}{3}$$
$$\frac{95}{6}\times \frac{10}{3}$$
$$\frac{95\times 10}{6\times 3}$$
$$\frac{950}{18}$$
$$\frac{475}{9}$$
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$\frac{5 ^ {2} \cdot 19}{3 ^ {2}} = 52\frac{7}{9} = 52.77777777777778$
