IBPS Clerk Mains 2018 Paper

Ram and Shyam entered in a business by making investment of ₹ 4000 & ₹5500 respectively. After six months Ram & Shyam withdrew ₹ 1000 and ` 1500 respectively and Mohan joined them with capital of ₹ 4x. If after one year and three months Mohan received ₹ 2250 as profit share out of total profit of ₹12250, then find investment of Mohan?