Question
$\frac{8}{\Box}=\frac{3.2}{4}$

Answer

We have, $\frac{8}{?}=\frac{3.2}{4}$
$\Rightarrow\frac{8}{?}=\frac{3.2\times2.5}{4\times2.5}$
$\Rightarrow\frac{8}{?}=\frac{8}{10}$ On comparing, we get $?=10$

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