TCS Previous Year Question on Alligation Rule
Duration: 11 min
This video lesson is available to enrolled students.
Inside: a video lesson and guided study material.
Module outline
- Paper 1 | Reasoning Test: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Puzzle Solving (Puzzles), Venn Diagram, Analogy, Ranking, Order and Sequence, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Cubes & Dices, Analytical Reasoning (Counting Figures Reasoning), Calendar, Alphabet and Word Tests, Numerical Reasoning, Number System, Averages, Mixtures and Alligation, Percentages, Series Completion, Analogy and Classification, Patterns in Two-Dimensional Figures, Coding and Decoding, Mathematical Operations, Direction Sense, Algebra, Logical Deduction and Induction, Syllogisms and Venn Diagrams, Critical Reasoning, Order, Ranking and Sequence, Reading Comprehension, Profit, Loss and Discount, Constraint Puzzles, Speed, Time and Distance, Traverse Surveying, Ratio and Proportion, Time and Work, Mensuration, Permutations and Combinations, Clocks and Calendars, Data Interpretation, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Vocabulary, Blood Relations, Data Sufficiency
- Paper 1 | Numerical Analysis: Number System, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Sequence and Series (Series), Powers and Exponents (Surds and Indices), Algebra, Statistics, Data Interpretation, Mental Ability, Arithmetic, Logarithm, Profit and Loss, Simple Interest and Compound Interest, Speed Time and Distance, Mixture and Alligation, Mensuration and Geometry, Permutation and Combination, Probability, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Sentence Structure and Correction, Data Sufficiency, Trigonometry, Measurement and Quantity Take-Off, Signal Space and Optimum Detection, Probability, Statistics, Algebra, Time and Work, Speed, Time and Distance, Data Interpretation, Graph Theory, Combinatorics
- Paper 1 | General Knowledge: State Wise GK, History, Geography, GK- Current Affairs, Static General Knowledge, Polity, Indian Economy
- Paper 1 | DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control, Relational Calculus, Database Security & Authorization, Database Recovery
- Paper 1 | Data Communication & Network: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Network Security, Security in Mobile and Wireless Computing, Input Output Organisation, File Management, Hardware Basics, Terms & Abbreviations, Protocols & Services, Network Access Technologies, Cyber Safety and Security, Basics of COA
- Paper 2 | System Analysis & Design: Fundamentals of Systems and Information Systems, SDLC and Development Approaches, Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, Security, Risk Management & Maintenance, extras
- Paper 2 | Programming Language (Java): Java Fundamentals, OOPS with Java, Array, String, IO & References, Generic & Collections, Multithreading, Java, Miscellaneous, Control Flow, OOPS with C++, Stack, C Fundamentals, Arrays & Pointers, Object Oriented Technology, Control Flow & Looping, Introduction to Python
AI summary & chapters
AI Summary
An AI-generated summary of this video lecture.
This educational video, presented by Yash Jain, is a comprehensive tutorial on solving mixture and alligation problems, a common topic in competitive exams like the TCS exam. The lecture begins with an introduction to the core concept of alligation, which is a method to find the ratio in which two or more ingredients at different prices must be mixed to achieve a desired average price. The instructor first explains the 'Basic Rule of Alligation' using a diagram that visually represents the relationship between the lower price, higher price, and the average price, leading to the formula: (Higher Price - Average Price) : (Average Price - Lower Price). To demonstrate this, a practical example is solved using the traditional algebraic approach, where the prices of Item A (Rs. 450 per kg) and Item B (Rs. 510 per kg) are used to find the ratio for a mixture costing Rs. 475 per kg. The video then introduces a faster, more efficient method known as the 'X short trick,' which simplifies the calculation by directly subtracting the prices from the average price to get the ratio. The video concludes with a final 'Thanks for Watching' screen.
Chapters
0:00 – 2:00 00:00-02:00
The video opens with an animated title card featuring a cartoon scientist in a lab, with the word 'MIXTURE' visible at the bottom. This transitions to a presentation slide with a geometric background, displaying the title 'MIXTURES & ALLIGATIONS' and the instructor's name, 'By Yash Jain'. A small video feed of the instructor, Yash Jain, is in the bottom right corner. He introduces the topic, explaining that the video will cover mixture and alligation problems, which are frequently asked in competitive exams such as the TCS exam.
2:00 – 5:00 02:00-05:00
The instructor begins explaining the 'Alligation Rule'. The screen shows a handwritten note titled 'Basic Rule of Alligation'. The text explains that if item 'A' is sold at a lower price (x) and item 'B' at a higher price (y), and they are mixed in a ratio to get an average price (a), the required ratio is (y-a) : (a-x). A diagram is drawn with 'lower price (x)', 'higher price (y)', and 'average price (a)' connected by lines, visually representing the rule. The instructor then introduces a problem: 'Item A is sold at Rs. 450 per kg & Item B is sold at Rs. 510 per kg. In what ratio A & B should be mixed so that the mixture costs Rs. 475 per kg?'. He labels this as a 'Traditional Approach' and begins to solve it by setting up variables p and q for the quantities of A and B, respectively.
5:00 – 10:00 05:00-10:00
The instructor continues the traditional approach. He writes the total cost as '450p + 510q' and the total quantity as 'p + q'. He then sets up the equation for the average price: (450p + 510q) / (p + q) = 475. He proceeds to solve this equation algebraically, multiplying both sides by (p + q) to get 450p + 510q = 475p + 475q. By rearranging terms, he finds 35q = 25p, which simplifies to the ratio p:q = 35:25, or 7:5. He then transitions to a faster method, the 'X short trick', by drawing a diagram with the prices 450, 510, and the average 475. He shows the differences: 510 - 475 = 35 and 475 - 450 = 25, and states that the ratio is 35:25, which simplifies to 7:5, matching the traditional method.
10:00 – 11:05 10:00-11:05
The video concludes with a final screen. The background is a dark purple gradient. In the center, the text 'THANKS FOR WATCHING' is displayed in large, white, capitalized letters. This is the end of the lecture, summarizing the key takeaway that the 'X short trick' provides a quick and efficient way to solve alligation problems, which is particularly useful for time-constrained competitive exams.
The video provides a clear, step-by-step tutorial on solving mixture and alligation problems. It effectively contrasts the traditional, algebraic method with a faster, more intuitive 'X short trick'. The core concept, the alligation rule, is introduced with a visual diagram and a clear formula. The example problem is solved using both methods, demonstrating that they yield the same result (a 7:5 ratio) but that the shortcut is significantly quicker. The progression from theory to practical application, and from a slower method to a faster one, makes the content highly effective for students preparing for competitive exams.