Other LRDI
Other LRDI covers problem types in Logical Reasoning and Data Interpretation that do not fall neatly into standard categories like arrangements, Venn diagrams, games, or routes. These are often hybrid sets that combine multiple concepts (logic + arithmetic, arrangement + percentages, etc.), or unique formats designed to test adaptability and problem-solving under uncertainty.
Key Features of Other LRDI
- Unconventional formats: Data may be presented in stories, charts, coded tables, or custom diagrams.
- Hybrid reasoning: Requires both logical deduction and numerical calculations.
- Multiple variable sets: Often involve people, places, numbers, and conditions simultaneously.
- Novel question framing: Situations may not fit into a single “known” category (like bar graphs or blood relations).
Common Types in “Other LRDI”
| Type | Description | Example |
|---|---|---|
| Hybrid Sets | Mix of reasoning and arithmetic. | A sales puzzle combining profit %, seating order, and distribution. |
| Data Sufficiency in LRDI Form | Decide if given conditions are enough to solve, without always calculating. | Is the total profit determinable with given ratios? |
| Puzzle Variants | Custom structures like ranking with conditional equations. | A contest where scores are linked with shifting ranks. |
| Unstructured Caselets | Paragraph-based data with unusual or incomplete details. | Festival data about food stalls, visitors, and revenue. |
| Logical Data Mapping | Map coded/abstract data to meaningful categories. | Matching animals, habitats, and traits from cryptic statements. |
How to Approach Other LRDI
- Read the entire set carefully: Unstructured data may hide definitions or rules.
- Identify known concepts: Break it down into arrangement, arithmetic, or classification parts.
- Organize visually: Even if not asked, convert data into tables, matrices, or diagrams.
- Check sufficiency vs calculation: Sometimes solving fully is unnecessary; logical sufficiency is enough.
- Work step by step: Hybrid sets can be complex—split into sub-parts.
Conceptual Tips and Common Mistakes
- Don’t force-fit: Avoid treating every unusual puzzle as arrangement or Venn; adapt to structure.
- Watch for hidden math: Ratios, averages, and percentages often sneak into logic puzzles.
- Stay flexible: These are designed to test adaptability, not rote methods.
- Practice uncommon formats: Builds speed in handling unexpected questions.
Examples
Example 1 — Hybrid Puzzle
A company has 4 employees. Each sits in a row, and their salaries are in ratio 2:3:4:5. If the total salary is ₹70,000, who sits at which place?
Answer: Salaries = 10,000 : 15,000 : 20,000 : 25,000. Placement deduced via given seating rules.
Example 2 — Data Sufficiency
Statement: The average marks of 4 students is 60. Additional info:
- Total marks of A and B = 140.
- C’s marks = 70.
Question: Is D’s score determinable?
Answer: Yes → from (1) + (2) + total = 240.
Example 3 — Puzzle Variant
In a contest, A scores more than B, B scores more than C, but C beats A in tiebreaker points.
Question: Who ranks second?
Answer: Depends on whether primary ranking is by main score or tiebreaker → requires careful reading.
Example 4 — Logical Data Mapping
Four animals (Lion, Tiger, Elephant, Deer) live in different habitats.
- Lion not in grassland.
- Tiger in jungle.
- Elephant not in desert.
Answer: Assign habitats logically until all fit → e.g., Lion = desert, Tiger = jungle, Elephant = forest, Deer = grassland.