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. 20
- C. 25
- D. 33
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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?
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