Ravi starts a business with $ 45000. After a certain period of time he is joined by Mohan who invests $ 30000. At the end of the year they divide the profit in the ratio 9 : 4. When did Mohan join Ravi?

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Ravi starts a business with $ 45000. After a certain period of time he is joined by Mohan who invests $ 30000. At the end of the year they divide the profit in the ratio 9 : 4. When did Mohan join Ravi?

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