Some persons can do a piece of work in 12 days Two times the number of such persons will do half of ...........

Quant (SSC) Time and work

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Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of the work in

9 days

6 days

5 days

3 days

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Explanation:

To solve this question, we can apply a short trick approach;
If M₁ persons can do W₁work in D₁ days and M₂ persons can do W₂ work in D₂ days then we have a short-trick formula which is M₁D₁W₂= M₂D₂W₁
Given:
M₁= m, M₂ = 2m, D₁ = 12 days, D₂ = ?, W₁ = w, W₂ = w/2
Now, as
M₁D₁W₂= M₂D₂W₁
m × 12 x w/2 = 2m × ? × w
⇒ ? = m × 6 × w /2m x w
⇒ ? = 6/2 = 3 days