A starts a business with Rs. 60,000. B joins later with Rs. 80,000 and at the year end their profits are equal. After how many months did B join?
Correct answer A. 3 months
Explanation
80,000 × (12 - x) = 60,000 × 12, so 12 - x = 9 and x = 3. B joined after 3 months.
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