$$3 \times 5 \frac{ 1 }{ 5 }$$
$\frac{78}{5}=15.6$
$$3\times \frac{25+1}{5}$$
$$3\times \frac{26}{5}$$
$$\frac{3\times 26}{5}$$
$$\frac{78}{5}$$
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$\frac{2 \cdot 3 \cdot 13}{5} = 15\frac{3}{5} = 15.6$
