If 18 doors can be painted by 12 workers of equal working capacity in a day, then how many workers are required to paint 30 doors in a day?

A 15

B 18

C 20

D 24

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By applying inverse proportion :-

Door worker door worker
18 12 30 X



18?X=12?30

X=12?30/18
=360/18= 20

C) is the answer
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