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If 10 persons can do a job in 20 days then...

This question belongs to Arithmetic Ability Time And Work
Time and Work
?

If 10 persons can do a job in 20 days, then 20 person with twice the efficiency can do the same job in:

Answer & Solution
Correct Answer: Option A
By work equivalence method,
man × days × work = MAN × DAYS × WORK
10 × 20 × 1 = 20 × 2 × x
→ x = 5 days
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