पवन, कुरैशी और रितेश ने क्रमशः रुपये (2x + 200), रुपये (3x + 300), और रुपये (4x + 400) के शुरुआती निवेश के साथ एक व्यवसाय शुरू किया। एक वर्ष के बाद, पवन, कुरैशी और रितेश ने अपने निवेश में क्रमशः रुपये 200, रुपये 300 और रुपये 400 की वृद्धि की। यदि 2 वर्ष के अंत में कुल लाभ रुपये 18,000 है, तो कुरैशी का लाभ हिस्सा ज्ञात कीजिए।

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?