Question : After working for 20 days, Shikha finds that only 20 percent of the work is done. She employs Tina who is 100 percent more efficient than Shikha. In how many days Tina alone can complete the whole work?
Option 1: 40 days
Option 2: 30 days
Option 3: 50 days
Option 4: 60 days
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Correct Answer: 50 days
Solution : Shikha worked for 20 days and completed 20% of the work Let the efficiency of Shikha is 1 unit per day. Shikha works 20 units in 20 days which is 20% of the work. So, total work = 100 units Since Tina is 100% more efficient than Shikha So, the efficiency of Tina will be 2 units per day. Time taken by Tine to finish the total work = $\frac{100}{2}$ = 50 days Hence, the correct answer is 50 days.
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Question : A can do a work alone in 60 days and B can do the same work alone in 33.33% less time taken by A. Find the time taken by B to complete the work alone.
Option 1: 30 days
Option 2: 17 days
Option 3: 22 days
Option 4: 40 days
Question : Dev completed the school project alone in 40 days. How many days will Arun alone take to complete the same work if he is 25% more efficient than Dev?
Option 1: 35 days
Option 2: 14 days
Option 3: 32 days
Option 4: 16 days
Question : M alone can complete a work in 50 days and N alone can complete the same work in 100 days. If both of them work together, then in 25 days what percentage work of the total work will be completed?
Option 1: 60%
Option 2: 55%
Option 3: 75%
Option 4: 80%
Question : Reshma alone can do a work in 14 days. Bhavana is 40% more efficient than Reshma. The number of days, Bhavana alone will take to do the same piece of work is:
Option 1: 10 days
Option 2: 40 days
Option 3: 28 days
Option 4: 14 days
Question : A can complete 25% of a work in 10 days. B can complete 40% of the same work in 16 days. In how many days will A and B together complete twice the work mentioned above?
Option 1: 20
Option 2: 40
Option 3: 60
Option 4: 50
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