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Proportions

Write true or...

Question

Write true or false.
$25 : 1 :: 40 : 160$

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Solution

We know $x : y :: z : a$
$\frac{x}{a} = \frac{y}{z}$
Same here, $25 : 1 :: 40 : 160$
$\frac{250}{160} = \frac{1}{40}$
which is not equal . So false.

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