Anil alone can finish a job in 8 days and Bhaskar alone in 12 days. They work on alternate days, Anil starting on day 1. The job is finished in how many days?

Take the job as 24 units: Anil does 3 units a day, Bhaskar 2, so each Anil-Bhaskar pair of days completes 5 units. After 8 days (4 pairs) 20 units are done. Day 9 is Anil's: 3 more units → 23. Only 1 unit is left and it is Bhaskar's turn at 2 units a day, so he needs half a day. Total = 9.5 days.