Question
Kusum, Joy and Mona together can complete a piece of work in (y-18) days. The efficiency of Kusum is 62.5% less than the efficiency of Mona. Joy alone can do the same piece of work in 120 days. The efficiency of Kusum is 25% less than the efficiency of Joy. Find out the time taken by Kusum alone to complete the same piece of work alone.
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