$$\frac { 6 } { 10 } \times \frac { 5 } { 20 }$$
$\frac{3}{20}=0.15$
$$\frac{3}{5}\times \frac{5}{20}$$
$$\frac{3}{5}\times \frac{1}{4}$$
$$\frac{3\times 1}{5\times 4}$$
$$\frac{3}{20}$$
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$\frac{3}{2 ^ {2} \cdot 5} = 0.15$