$$\frac{ 3 }{ 5 } \times \frac{ 7 }{ 10 } \div \frac{ 2 }{ 5 }$$
$\frac{21}{20}=1.05$
$$\frac{\frac{3\times 7}{5\times 10}}{\frac{2}{5}}$$
$$\frac{\frac{21}{50}}{\frac{2}{5}}$$
$$\frac{21}{50}\times \frac{5}{2}$$
$$\frac{21\times 5}{50\times 2}$$
$$\frac{105}{100}$$
$$\frac{21}{20}$$
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$\frac{3 \cdot 7}{2 ^ {2} \cdot 5} = 1\frac{1}{20} = 1.05$
