$$\frac{6}{1}+\frac{21}{4}+\frac{19}{2}+\frac{39}{4}$$
$\frac{61}{2}=30.5$
$$6+\frac{21}{4}+\frac{19}{2}+\frac{39}{4}$$
$$\frac{24}{4}+\frac{21}{4}+\frac{19}{2}+\frac{39}{4}$$
$$\frac{24+21}{4}+\frac{19}{2}+\frac{39}{4}$$
$$\frac{45}{4}+\frac{19}{2}+\frac{39}{4}$$
$$\frac{45}{4}+\frac{38}{4}+\frac{39}{4}$$
$$\frac{45+38}{4}+\frac{39}{4}$$
$$\frac{83}{4}+\frac{39}{4}$$
$$\frac{83+39}{4}$$
$$\frac{122}{4}$$
$$\frac{61}{2}$$
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$\frac{61}{2} = 30\frac{1}{2} = 30.5$
