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A can do a piece of work in 70 days and...

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

A can do a piece of work in 70 days and B is 40% more efficient then A. Then the number of days taken by B to do the same work is = ?

Answer & Solution
Correct Answer: Option C
  A   :   B
Efficiency →   100% : 140%
  5 : 7
    ⤩  
Time 7 : 5
  ×10↓   ↓×10
Actual Time   70 days   50 days
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