$$3 \quad 1 : 2 1 : 4$$
$\frac{3}{8}=0.375$
$$\frac{\frac{3}{2}\times 1}{4}$$
$$\frac{\frac{3}{2}}{4}$$
$$\frac{3}{2\times 4}$$
$$\frac{3}{8}$$
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$\frac{3}{2 ^ {3}} = 0.375$
