$$\frac{55}{360}\times540$$
$\frac{165}{2}=82.5$
$$\frac{11}{72}\times 540$$
$$\frac{11\times 540}{72}$$
$$\frac{5940}{72}$$
$$\frac{165}{2}$$
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$\frac{3 \cdot 5 \cdot 11}{2} = 82\frac{1}{2} = 82.5$