Check the following number is in proportion or not? $16, 20, 20 and 25 .$

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Solution

Check the numbers are in proportion or not:
Let, $16, 20, 20 and 25$ are in proportion.
So, $16 : 20 : : 20 : 25$
$\Rightarrow \frac{16}{20} = \frac{20}{25}$
$\Rightarrow \frac{4}{5} = \frac{4}{5}$
Hence, $16, 20, 20 and 25$ are in proportion.

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