Ishita is 50% more efficient than Farooq. Together they can catalogue a library in 18 days. How many days would Ishita take alone?

Explanation

1. 01

   Let Farooq do 2 units per day; Ishita does 3 units. Together: 5 units per day.

2. 02

   Total work = $5 \times 18 = 90$ units.

3. 03

   Ishita alone: $90 \div 3 = 30$ days.