$$(\frac{3}{5}+\frac{3}{4})+\frac{1}{6}=$$
$\frac{91}{60}\approx 1.516666667$
$$\frac{12}{20}+\frac{15}{20}+\frac{1}{6}$$
$$\frac{12+15}{20}+\frac{1}{6}$$
$$\frac{27}{20}+\frac{1}{6}$$
$$\frac{81}{60}+\frac{10}{60}$$
$$\frac{81+10}{60}$$
$$\frac{91}{60}$$
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$\frac{7 \cdot 13}{2 ^ {2} \cdot 3 \cdot 5} = 1\frac{31}{60} = 1.5166666666666666$
