Short Tricks to Solve Questions Quickly

Duration: 11 min

This video lesson is available to enrolled students.

Return to /learn/RSSB-SENIOR-COMPUTER-INSTRUCTOR/paper-1-basic-numeracy/profit-and-loss/basic-concepts-formulas-and-quick-transformations/asset-short-tricks-to-solve-questions-quickly after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: अनुपात और समानुपात / Ratio and Proportion, Divisibility Rules, मिश्रण और एलिगेशन / Mixture and Alligation, Permutation and Combination, Logarithm, संख्या पद्धति / Number System, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, Sequence and Series (Series), समय, चाल और दूरी / Time, Speed and Distance, प्रतिशत / Percentage, औसत / Average, घन क्षेत्रमिति / Solid Mensuration, Age Problems, Arithmetic, Statistics, Probability, लाभ, हानि और बट्टा / Profit, Loss and Discount, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, समय और कार्य / Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy, समुच्चय, संबंध, फलन और विविक्त गणित / Sets, Relations, Functions and Discrete Mathematics, संख्या पद्धति और संख्या सिद्धांत / Number Systems and Number Theory, निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति / Coordinate Geometry, Vectors and 3D Geometry, बहुपद, समीकरण और सम्मिश्र संख्याएँ / Polynomials, Equations and Complex Numbers
  3. Paper-1 & 2 | Data Interpretation: आँकड़ा निर्वचन / Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: श्रेणी / Series, कूट लेखन एवं कूट वाचन / Coding-Decoding, Data Sufficiency, अशाब्दिक तर्क / Non-Verbal Reasoning, Syllogisms, बैठक व्यवस्था एवं पहेलियाँ / Seating Arrangement and Puzzles, रक्त संबंध / Blood Relations, दिशा एवं दूरी / Direction and Distance, Analytical Reasoning (Counting Figures Reasoning), गणितीय संक्रियाएँ एवं लुप्त संख्या / Mathematical Operations and Missing Numbers, कैलेंडर एवं घड़ी / Calendar and Clock, Clock, घन, पासा एवं आकृतियों की गिनती / Cubes, Dice and Figure Counting, वेन आरेख, न्याय वाक्य एवं असमानता / Venn Diagrams, Syllogism and Inequalities, सादृश्यता एवं वर्गीकरण / Analogy and Classification, क्रम एवं रैंकिंग / Order and Ranking, कथन आधारित तार्किक विवेचन / Statement-Based Reasoning, Data Arrangement, वर्णमाला एवं संख्या परीक्षण / Alphabet and Number Test, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: आँकड़ों की पर्याप्तता एवं निर्णय क्षमता / Data Sufficiency and Decision Making
  7. Paper-1 | General Science: वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: राज्य विशेष सामान्य ज्ञान / State-Specific General Knowledge, समसामयिकी / Current Affairs
  9. Paper-2 | Fundamentals of Computer: Basics of COA, Number System, Floating Point Rep, Number Representation
  10. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits
  11. Paper-2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Linux OS, Distributed Systems
  12. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  13. Paper-2 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  15. Paper 2 | Oops, C++, Java: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  16. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  17. Paper 2 | Emerging Trends and AI: Emerging Tech Trends, कंप्यूटर के मूल सिद्धांत / Computer Fundamentals, व्यापार, विपणन एवं उपभोक्ता संरक्षण / Trade, Marketing and Consumer Protection, कंप्यूटर नेटवर्क / Computer Networks
  18. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Advanced Algorithms
  19. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Ethical Hacking
  20. Paper-2 I Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  21. Paper-2 | Computer Organization and Architecture: Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations
  22. Paper-2 | Web Development: JavaScript-Basics, HTML Basics, CSS, XML
  23. Pedagogy: वृद्धि और विकास / Growth and Development, Concept of Pedagogy, संज्ञानात्मक प्रक्रियाएँ / Cognitive Processes, विकास के सिद्धांत / Theories of Development, समावेशी शिक्षा / Inclusive Education, Experiential Pedagogy, समाजीकरण और जेंडर / Socialisation and Gender, National Education Policy (NEP) 2020
  24. Live Sessions: RSSB Live Sessions
  25. RSSB Paper 1 - Full Mock Tests:
  26. RSSB Paper 2 - Full Mock Tests:
  27. SCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video is a comprehensive lecture on profit and loss calculations, presented by an instructor from Knowledge Gate. The video begins with a conceptual introduction using a balance scale to illustrate the relationship between profit and loss. It then systematically introduces key formulas for calculating profit, loss, and selling price (SP) in terms of cost price (CP) and marked price (MP), using the standard formulas: Profit = (Profit% / 100) * CP, Loss = (Loss% / 100) * MP, SP = CP(100 + P)/100, and SP = MP(100 - d)/100. The core of the video is a detailed, step-by-step solution to a specific problem: finding the cost price of an article sold for Rs. 300 at a 25% loss. The instructor demonstrates three distinct methods to solve this: the Formula Method, the Percentage Method, and the Ratio Method. Each method is clearly explained and written out on a virtual green board, showing the logical progression from the given data to the final answer. The video concludes with a thank you message, emphasizing its purpose as a resource for aptitude preparation.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a conceptual diagram of a 3D white figure standing on a balance scale, with the words 'PROFIT' in green on the left and 'LOSS' in red on the right, visually representing the core topic. The scene then transitions to a virtual green board where the instructor begins to write the fundamental formulas for profit and loss. The first formula written is 'Profit = (Profit% / 100) * CP' (labeled as ①). The instructor then writes the formula for loss: 'Loss = (Loss% / 100) * MP' (labeled as ②). The video also shows a small inset of the instructor, Yash Jain Sir, and text indicating the content is from 'Knowledge Gate Educator'.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues to build the foundational formulas on the green board. He writes the formula for Selling Price (SP) in terms of Cost Price (CP) and Profit Percentage: 'SP = CP(100 + P)/100' (labeled as ③). He then writes the formula for SP in terms of Marked Price (MP) and Discount Percentage: 'SP = MP(100 - d)/100' (labeled as ④). The instructor explains these formulas, emphasizing their importance for solving problems. The on-screen text 'IMPORTANT FORMULAS DISCUSSED SO FAR' remains at the top, and the 'KNOWLEDGE GATE' logo is visible at the bottom right.

  3. 5:00 – 10:00 05:00-10:00

    The video transitions to a specific problem: 'Q1: Find the cost price of an article which is sold at Rs. 300 at a loss of 25%?'. The instructor introduces three methods to solve it. First, he uses the 'In terms of Percentage' method, writing 'SP = CP(100 - L)/100' and substituting the values to get '300 = CP(75/100)', which he solves to find CP = 400. Next, he demonstrates the 'In terms of Ratio' method, showing that a 25% loss means the ratio of CP to SP is 4:3, and using the proportion '3 parts = 300', he finds 1 part = 100, so CP = 4 parts = 400. The instructor clearly labels each method and shows the step-by-step calculations.

  4. 10:00 – 11:09 10:00-11:09

    The instructor presents the third method, the 'Percentage Method', to solve the same problem. He writes 'CP = 100%' and 'SP = 75%' (since a 25% loss means SP is 75% of CP). He then sets up the proportion '75% → 300', and calculates '1% → 4', leading to '100% → 400'. This confirms the cost price is Rs. 400. The video concludes with a final screen displaying 'THANKS FOR WATCHING' over a blue, abstract background with mathematical symbols, reinforcing the educational purpose of the content.

The video provides a structured and methodical approach to solving profit and loss problems. It begins by establishing the core mathematical relationships through formulas, then applies these concepts to a real-world problem. The key teaching strategy is the demonstration of multiple solution methods—Formula, Percentage, and Ratio—each offering a different perspective and reinforcing the underlying principles. This multi-method approach helps students understand the problem from various angles and choose the most efficient technique for different scenarios, making the lesson both comprehensive and practical for aptitude test preparation.

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