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
Correct Answer: 10 days
Solution :
Let the time Bhavana takes to complete the work as B.
Since Bhavana is 40% more efficient than Reshma,
she can complete the work in $\frac{100\%}{140\%}$ = $\frac{5}{7}$th of the time that Reshma takes.
⇒ B = $\frac{5}{7} × 14$
⇒ B = $10$
Hence, the correct answer is 10 days.
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