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Person A started a business with Rs. 21,000. Person B joined later with Rs. 42,000. If the year-end profits are divided in a 3:1 ratio, how long did Person B join for?
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Solution: Step 1: Let's assume Person B joined for 't' months.
Step 2: Person A's investment for the whole year = 21,000 * 12.
Step 3: Person B's investment = 42,000 * t.
Step 4: The profit ratio is given as 3:1, so we can set up the equation:
(21,000 * 12) / (42,000 * t) = 3 / 1
Step 5: Solving for t:
252,000 / (42,000 * t) = 3
252,000 = 126,000 * t
t = 252,000 / 126,000
t = 2
Step 6: Therefore, Person B joined for 2 months.