Question : A can do a certain work in 9 days. B is 80% more efficient than A. How many days will B and A together take to do the same work?
Option 1:
Option 2:
Option 3:
Option 4:
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Correct Answer:
Solution :
According to the question,
A can do a certain work in 9 days.
B is 80% more efficient than A.
So, the ratio of efficiencies of A and B = 100 : 180 = 5 : 9
Total work = Time
⇒ Total work = 9
Consider the total efficiency of A and B = 5 + 9 = 14
Total work completed by A and B together =
Hence, the correct answer is
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