$$6 : 8 = x : 20 \quad 8$$
$x = \frac{15}{8} = 1\frac{7}{8} = 1.875$
$$5\times 6=2x\times 8$$
$$30=2x\times 8$$
$$30=16x$$
$$16x=30$$
$$x=\frac{30}{16}$$
$$x=\frac{15}{8}$$
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