Question

12 painters can paint a building in 25. days. in how many days can 20 painters paint the same building?

Answer 1

Thanks for your question!! ☺

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As we observed, It's indirect proportion.

So,

Firstly let 20 painters paint the same building in x days.

Now,
12 × 25 = 20 × x

=) (12 × 25) ÷ 20 = x

=) 15 = x

20 painters paint the same building in 15 days.

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Thanks

✌✌

Answer 2

Multiplied constant=(12×25) man days
For 20 painters time taken =
$= \frac{12 \times 25}{20} \\ = 15days$