$$( \frac{ 21 }{ 20 } ) \frac{ 5 }{ 2 }$$
$\frac{21}{8}=2.625$
$$\frac{21\times 5}{20\times 2}$$
$$\frac{105}{40}$$
$$\frac{21}{8}$$
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$\frac{3 \cdot 7}{2 ^ {3}} = 2\frac{5}{8} = 2.625$