Mathematics · Data Sufficiency and Quantity Comparison

Compare the values of the following three quantities: Quantity I: Amit and Rohit started a business by investing ₹y and ₹(y + 12,000), respectively. After 2 years, Sneha joined them with a capital of ₹(y + 20,000). At the end of the 2nd year, Rohit exited, and at the end of the 3rd year, Amit also left. Sneha continued with her capital for 2 more years. If Amit and Rohit received the profit in the ratio 3 : 4, then find the total amount of capital invested by all three partners. Quantity II: A metro train of length (M + 360) meters is moving at a speed of ((M / 18) - 10) m/s. It takes the same time to cross a signal post as another freight train of length 2M meters running at a speed of ((M / 45) - 4) m/s. Find the time (in seconds) taken by a local train of length M / 3 meters to cross a platform of length 480 meters if it runs at a speed of 36 km/h. Quantity III: A wholesaler marked a batch of watches y% above the cost price and offered two successive discounts of 30% and 10% to a retailer. In this deal, the wholesaler earned a profit of 25% on the cost price. If the final selling price of the watch was Rs. 126y, find the cost price of the watch.