$$20\times\frac{1}{4}\times\frac{1}{5}\div\frac{1}{8}+10-15$$
$3$
$$\frac{\frac{20}{4}\times \frac{1}{5}}{\frac{1}{8}}+10-15$$
$$\frac{5\times \frac{1}{5}}{\frac{1}{8}}+10-15$$
$$\frac{1}{\frac{1}{8}}+10-15$$
$$1\times 8+10-15$$
$$8+10-15$$
$$18-15$$
$$3$$
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