E, F and G together can complete a work in 12 days. If E and F together can complete the same work in 30 days, then in how many days can G alone complete the same work?
Answer & explanation
Correct answer: option 2
E + F + G = 12 days,
E + F = 30 days,
⇒ E + F + G = 5 (Efficiency)
⇒ 2 + G = 5,
⇒ G = 3,
Time required by G to complete the work alone = \(\frac{60}{3}\) = 20 days, ..(\(\frac{Work}{Efficiency}\) = Time)