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Narender can do 4/5th of work in 20 days. The efficiency of Ajay is 25% more than that of Narender. Both Narender and Ajay started working together and left the work after five days. Neha completed the remaining work in 11 days. The efficiency of Neha is how much percent more/less than that of Narender?
25% less
20% less
20% more
25% more
None of these
- Narender does 4/5 of the work in 20 days, so total work = 20 / (4/5) = 25 days for full work.
- Narender's efficiency = 1/25 work/day.
- Ajay is 25% more efficient than Narender: 1/25 × 1.25 = 1/20 work/day.
- Together, in 1 day: 1/25 + 1/20 = (4+5)/100 = 9/100 work/day.
- In 5 days: 9/100 × 5 = 45/100 = 9/20 of the work is done.
- Work left = 1 - 9/20 = 11/20.
- Neha did 11/20 of work in 11 days ? 1/20 work/day.
- Neha and Narender have same efficiency.
- So, Neha is neither more nor less efficient than Narender.
Correct answer: Option 5, None of these.
By: Parvesh Mehta ProfileResourcesReport error
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