$$20\frac{1}{4}\div\frac{3}{4}$$
$27$
$$\frac{\left(20\times 4+1\right)\times 4}{4\times 3}$$
$$\frac{1+4\times 20}{3}$$
$$\frac{1+80}{3}$$
$$\frac{81}{3}$$
$$27$$
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$3^{3}$
