$$(4)/( \frac{ 1 }{ 5 } )+( \frac{ 3 }{ 5 } ) \times ( \frac{ 1 }{ 10 } )+ \frac{ 1 }{ 25 } - \frac{ 1 }{ 10 }$$
$20$
$$4\times 5+\frac{3}{5}\times \frac{1}{10}+\frac{1}{25}-\frac{1}{10}$$
$$20+\frac{3}{5}\times \frac{1}{10}+\frac{1}{25}-\frac{1}{10}$$
$$20+\frac{3\times 1}{5\times 10}+\frac{1}{25}-\frac{1}{10}$$
$$20+\frac{3}{50}+\frac{1}{25}-\frac{1}{10}$$
$$\frac{1000}{50}+\frac{3}{50}+\frac{1}{25}-\frac{1}{10}$$
$$\frac{1000+3}{50}+\frac{1}{25}-\frac{1}{10}$$
$$\frac{1003}{50}+\frac{1}{25}-\frac{1}{10}$$
$$\frac{1003}{50}+\frac{2}{50}-\frac{1}{10}$$
$$\frac{1003+2}{50}-\frac{1}{10}$$
$$\frac{1005}{50}-\frac{1}{10}$$
$$\frac{201}{10}-\frac{1}{10}$$
$$\frac{201-1}{10}$$
$$\frac{200}{10}$$
$$20$$
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$2^{2}\times 5$
