$$\frac{ 45 }{ 3 } \times \frac{ 8 }{ 5 } \times \frac{ 6 }{ 4 } \times \frac{ 10 }{ 12 } =$$
$30$
$$15\times \frac{8}{5}\times \frac{6}{4}\times \frac{10}{12}$$
$$\frac{15\times 8}{5}\times \frac{6}{4}\times \frac{10}{12}$$
$$\frac{120}{5}\times \frac{6}{4}\times \frac{10}{12}$$
$$24\times \frac{6}{4}\times \frac{10}{12}$$
$$24\times \frac{3}{2}\times \frac{10}{12}$$
$$\frac{24\times 3}{2}\times \frac{10}{12}$$
$$\frac{72}{2}\times \frac{10}{12}$$
$$36\times \frac{10}{12}$$
$$36\times \frac{5}{6}$$
$$\frac{36\times 5}{6}$$
$$\frac{180}{6}$$
$$30$$
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$2\times 3\times 5$