Ashar can do a work in 40 days. He worked as it for 8 days and left the work, after which Aman joined the work and finished the remaining work in 16 days. How long will Aman take to complete the whole work ?

20 days

Total work = Time × Efficency

Ashar worked for 8 days and left the work.

Work done by Ashar in 8 days = 8 × 1 = 8

Remaining work = 32

Aman does the remaining work in 16 days.

Efficiency of Aman = \(\frac{32}{16}\) = 2

Now,

time taken by Aman to complete the work = \(\frac{40}{2}\) = 20 days

The correct answer is option (3) : 20 days