A is twice as good at writing a novel as B. Together they can finish writing the novel in 24 days. In how many days can A alone write the novel?

36

According to the question,

A is twice as good at writing a novel as B, therefore,

⇒ A : B = 2 : 1  (Efficiency)

⇒ Total work = (2 + 1) x 24 days = 3 x 24 = 72 units,   ..(Efficiency × Days = Total work)

⇒ Time taken by A to complete the work alone = \(\frac{72}{2}\) = 36 days,   ..(\(\frac{Work}{Efficiency}\) = Time)