Sai can do a piece of work alone in 50 days. Ria is 25% more efficient than Sai. What is the number of days that Ria will take to do the same piece of work alone?
Answer & explanation
Correct answer: option 3
Sai = 50 days,
According to the question,
Ria is 25% more efficient than Sai, therefore,
⇒ Ria : Sai = 125 : 100 = 5 : 4 (Efficiency)
⇒ Total work = Sai x 50 days = 4 x 50 = 200 units, ..(Efficiency × Days = Total work)
⇒ Time required by Ria to complete total work alone = \(\frac{200}{5}\) = 40 days, ..(\(\frac{Work}{Efficiency}\) = Time)