$$15+ \frac{ 16 }{ 21 } \times 5$$
$\frac{395}{21}\approx 18.80952381$
$$15+\frac{16\times 5}{21}$$
$$15+\frac{80}{21}$$
$$\frac{315}{21}+\frac{80}{21}$$
$$\frac{315+80}{21}$$
$$\frac{395}{21}$$
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$\frac{5 \cdot 79}{3 \cdot 7} = 18\frac{17}{21} = 18.80952380952381$
