Mathematics

12 men can make a certain number of screws in 30 days. The number of screws, of the same type will be made by 24 men in:
15 days
30 days
60 days
none of these

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Let 24 men take x days to make the same number of screws.

Men	Days
12	30
24	x

Since it is a case of inverse variation,

$\therefore 12 \times 30 = 24 \times x\\[1em] \Rightarrow 360 = 24x\\[1em] \Rightarrow x = \dfrac{360}{24}\\[1em] \Rightarrow x = 15$

Hence, option 1 is the correct option.

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