Here's a structured English solution guide for CAT 2019 Slot 1 Data Interpretation & Logical Reasoning (DILR) based on common question patterns:
1. Data Interpretation (DI) Section
Type 1: Table Analysis
Example Question:
"Given a table showing monthly sales of 3 products (A/B/C) over 6 months, find the month with maximum % increase in Product B sales compared to average sales of Product A."
Solution Strategy:
Calculate monthly % change for Product B:
(Sales_B_current - Sales_B_previous)/Sales_B_previous × 100
Compute average sales of Product A:
Total_A / 6
Compare % values using a ratio calculator.
Type 2: Bar Graph Comparison
Key Tips:
Use relative height comparisons (avoid exact calculations)
Look for "which is NOT true" type questions
Track maximum/minimum values for quick reference
2. Logical Reasoning (LR) Section
Puzzle-Based Questions
Example:
"8 people (A-H) sitting in 2 rows of 4. Each person has different attributes (age, gender, etc.). How many pairs have both attributes matching?"
Solving Method:
Create double matrix (rows vs columns)
Identify constraints using process of elimination
Use branch-and-bound technique for time efficiency
Seating Arrangement
Pro Tip:
Draw quick sketch with arrows for directions
Assign temporary variables (e.g., X) for unknowns
Verify constraints after each deduction
3. Common Pitfalls to Avoid
Overlooking Units Conversion (e.g., km to m, % to decimals)
Misapplying Average Formulas
Average = Total / Number of terms (not sum of averages)
Neglecting "At least" vs "Exactly" Questions
Time Management (dedicate 45-60 mins for 40 questions)
4. Sample Answer Format
Question 15: [Table Question]
Step 1: Calculate Q3 sales = 4500
Step 2: Compute % change = (4800-4500)/4500 ×100 = 6.67%
Answer: May (6.67% > March's 5.8%)
5. Recommended Practice
Solve 2-3 DI sets daily (focus on time per question < 2 mins)
Use official CAT 2019 question paper with timer
Review wrong answers using video solutions (e.g., BYJU'S, VEDantu)
Would you like me to elaborate on any specific question type or provide sample questions with detailed solutions?
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