$$\frac{ 30 }{ 40 } \times \frac{ 10 }{ 20 }$$
$\frac{3}{8}=0.375$
$$\frac{3}{4}\times \frac{10}{20}$$
$$\frac{3}{4}\times \frac{1}{2}$$
$$\frac{3\times 1}{4\times 2}$$
$$\frac{3}{8}$$
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$\frac{3}{2 ^ {3}} = 0.375$
