$$\frac{ 6+8+14+18+20 }{ 5 }$$
$\frac{66}{5}=13.2$
$$\frac{14+14+18+20}{5}$$
$$\frac{28+18+20}{5}$$
$$\frac{46+20}{5}$$
$$\frac{66}{5}$$
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$\frac{2 \cdot 3 \cdot 11}{5} = 13\frac{1}{5} = 13.2$
