$$\frac{ z }{ 3 } = \frac{ 4 }{ 5 }$$
$z = \frac{12}{5} = 2\frac{2}{5} = 2.4$
$$z=\frac{4}{5}\times 3$$
$$z=\frac{4\times 3}{5}$$
$$z=\frac{12}{5}$$
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