Discuss Forum
1. Rumi and Rony can finish a task working together in 12 days. If Rony alone can finish that in 20 days, how many days will Rumi need to finish the task working alone?
- A. 30
- B. 30
- C. 30
- D. 30
Answer: Option A
Explanation:
Together the can finish 1/12 of the work in a day.
Rony alone can finish 1/20 of the work in a day.
Rumi alone can finish = 1/12 - 1/20 = (5 - 3)/60 = 1/30 of the work in a day.
So, Rumi alone can finish the work in 30 days.
Post your comments here: