Question
A started a business with an investment of Rs.1800.
After some months, B joins the business with an investment of Rs.3600 and after two more months C joins the business with Rs.2800. If the annual profit share of A and B is equal, then find for how many months C invested his money?Solution
Let B joined after ‘x’ months. => 1800 ×  12 : (12 - x) ×  3600 : 2800 ×  (12 – x – 2) => 1800 ×  12 : (12 - x) ×  3600 : 2800 ×  (10 – x) => 1800 ×  12 = (12 - x) ×  3600 => 12 – x = 6 => x = 6 C invested his money = 10 – x = 4 months
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