12 labours can construct a road in 20 days. Then 30 labours can construct the same road in x days. The value of x will be found from the proportion.

12 : 30 :: 20 : x

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30 : 12 :: 20 : x

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0 : 12 : x : 20

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20 : 8 :: x : 20

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Solution

The correct option is B $12 : 30 :: 20 : x$
In the above question the value of x will be found from the proportion.
$30 : 12 : x : 20$

Then $x = \frac{30 \times 20}{12}$

$x = 50 D a y s$

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