Find the value of $x$ in the following proportion:
$x : 12 : : 5 : 3$

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Solution

These are in proportion so
$x : 12 = 5 : 3$
$\frac{x}{12} = \frac{5}{3}$
$3 x = 60 x = \frac{60}{3} = 20$
Hence the value of $x = 20$

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