Are the following quantities in proportion or not?
$20, 25, 80, a n d 100$

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Solution

Step 1: Product of extreme terms $= 20 \times 100 = 2000$
Product of middle terms $= 25 \times 8 = 2000$
Product of extreme terms $=$ Product of middle terms.
Hence, $20, 25, 80, a n d 100$ are in proportion.

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