$$\frac{ 18ab }{ 15bc } \times \frac{ 20cd }{ 24dc }$$
$\frac{a}{c}$
$$\frac{6a}{5c}\times \frac{20cd}{24dc}$$
$$\frac{6a}{5c}\times \frac{5}{6}$$
$$\frac{6a\times 5}{5c\times 6}$$
$$\frac{a}{c}$$
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$\frac{1}{c}$
