कार्तिक और बालाजी 5:6 के अनुपात में अपनी पूंजी के साथ एक साझेदारी करते हैं। 8 महीने के अंत में, कार्तिक अपनी पूंजी निकाल लेता है। यदि वे 5:9 के अनुपात में लाभ प्राप्त करते हैं, तो बालाजी की पूंजी का उपयोग कितने समय के लिए किया गया था?

Three partners invested in a business in the ratio 8:5:4. They invested their capital for 3 months, 10 months, and 9 months respectively. What was the ratio of their profits?

A started a business with an investment of ₹21,000 and after a few months, B joined him with an investment of ₹15,000. At the end of the year, the total profit was divided between them in the ratio 12 : 5. After how many months did B join the business?