$$\frac{1}{10}+\frac{1}{20}+\frac{1}{15}$$
$\frac{13}{60}\approx 0.216666667$
$$\frac{2}{20}+\frac{1}{20}+\frac{1}{15}$$
$$\frac{2+1}{20}+\frac{1}{15}$$
$$\frac{3}{20}+\frac{1}{15}$$
$$\frac{9}{60}+\frac{4}{60}$$
$$\frac{9+4}{60}$$
$$\frac{13}{60}$$
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$\frac{13}{2 ^ {2} \cdot 3 \cdot 5} = 0.21666666666666667$
