$$\{ 10 \times ( 20 \div 4 + 5 ) \} \div ( 20 \div 5 )$$
$25$
$$\frac{10\left(5+5\right)}{\frac{20}{5}}$$
$$\frac{10\times 10}{\frac{20}{5}}$$
$$\frac{100}{\frac{20}{5}}$$
$$\frac{100}{4}$$
$$25$$
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$5^{2}$
