A starts a business with Rs. 45,000. After some months B joins with Rs. 30,000. Their year-end profit is shared in the ratio 2 : 1. After how many months did B join?
Correct answer B. 3 months
Explanation
45,000 × 12 : 30,000 × t = 2 : 1, so 5,40,000 = 60,000t and t = 9 months. B therefore joined after 12 - 9 = 3 months.
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