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?

18 days 20 days 12 days 24 days

20 days

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)