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In this math tutorial from Open Eye 4 TNPSC, we solve a complex "Time and Work" problem involving three individuals (A, B, and C) working together and then leaving the task. This type of problem is a staple in TNPSC Group 4, Group 2, and other competitive exams. Key Highlights of the Video: Problem Statement: A can finish a work in 12 days, B in 15 days, and C in 20 days. They start working together, but C leaves after 2 days. How many more days will A and B take to finish the remaining work? Step-by-Step Methodology: Converting work days into individual efficiencies (1/12, 1/15, 1/20). [00:24] Calculating the total work completed by A, B, and C together in the first 2 days using the LCM method. [01:49] Determining the remaining work (3/5) after C's departure. [03:00] Solving for the number of additional days (x) required for A and B to complete the task. [04:20] Final Solution: We find that A and B will finish the remaining work in 4 more days. This tutorial is designed to help students master work-rate word problems with clear, logical steps and efficient calculation shortcuts.