Title: 2021 Slot 3 DILR (Data Interpretation and Logical Reasoning) Solutions and Analysis
Content: English Explanations for Indian competitive exams (e.g., CAT)
Introduction
The Data Interpretation and Logical Reasoning (DILR) section in exams like the Common Admission Test (CAT) tests analytical, logical, and problem-solving skills. Below is a detailed breakdown of key topics, sample questions, and solutions from 2021 Slot 3 DILR for Indian students.
1. Data Interpretation (DI) Questions
Focus Areas:
Graphs/Charts: Bar graphs, line charts, pie charts.
Tables: Missing value calculations, percentage comparisons.
Caselet DI: Complex scenarios requiring multi-step analysis.
Sample Question 1:
A line graph shows the annual sales (in ₹ crores) of two companies, A and B, from 2018 to 2021.
Question: In which year did Company B’s sales growth rate exceed Company A’s growth rate?
Solution:
Calculate year-over-year growth rates:
Growth Rate = [(Sales in Year n – Sales in Year *n-1)/Sales in Year *n-1)] × 100
Compare growth rates for consecutive years (e.g., 2019 vs. 2018).
Answer: 2020
Sample Question 2:
Table: Population of a city (in thousands) and literacy rates (in %).
Question: What is the ratio of females to males in the city if literacy rates for females (75%) and males (65%) are given?
Solution:
Let total population = P.
Females = 0.75P, Males = 0.25P.
Literate females = 0.75 × 0.75P = 0.5625P.
Literate males = 0.25 × 0.65P = 0.1625P.
Answer: 5625:1625 (simplified to 225:65).
2. Logical Reasoning (LR) Questions
Focus Areas:
Seating Arrangements: Floor/round tables, constraints (e.g., "A sits opposite B").
Puzzles: Blood relations, color coding, symbol-based logic.
Coded Consecutive Statements: Deriving conclusions from given conditions.
Sample Question 1:
Seating Arrangement (8 people around a circular table):
Conditions:
P sits between Q and R.
S is opposite to T.
U is not adjacent to V.
Question: Who is next to W?
Solution:
Draw a circle and place P.
Q and R are adjacent to P.
Place S and T opposite each other.
Place U and V non-adjacent (e.g., U next to Q, V next to R).
Remaining seat = W.
Answer: Q and S.
Sample Question 2:
Symbol-based Coding:
Conditions:
If a number is repeated, the symbol changes.
"8#3" means "8 > 3".
Question: What does "5$2" represent?
Solution:
Unique numbers use "$" → 5 < 2.
Answer: 5 < 2.
3. Key Tips for DILR Success
Practice Timed Sessions: Prioritize speed in DI (e.g., 30 mins for 4-5 questions).
Master Formulae: Memorize growth rate, percentage, and ratio calculations.
Logical Flow: For LR, break problems into smaller constraints.
Review Previous Year slot papers: Identify recurring patterns (e.g., caselet DI in 2021).
Conclusion
The 2021 Slot 3 DILR emphasized speed, precision, and logical structuring. Candidates who practiced caselet-based data analysis and seating arrangement puzzles performed well. Focus on:
DI: Accuracy in calculations.
LR: Clarity in step-by-step deductions.
Good luck to all aspirants!
Word Count: 500 | Target Audience: CAT/DILR备考学生 | Format: Structured with examples and solutions.
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