Caselet DI: How to Solve Paragraph-Based Data Interpretation Fast

Caselet DI is the format that separates average scorers from top performers in banking exams.

In regular DI, the data is handed to you visually — a table, bar graph, or pie chart with all values clearly labeled. Your job is to read and calculate. In Caselet DI, the same data is buried inside a paragraph of text. There are no rows or columns. There are no bars or segments. There is only a block of sentences, and inside those sentences are 6–8 inter-related numbers that you must extract, organize, and then use to answer 4–5 questions.

This format appears in IBPS PO Prelims (2 sets, 10 questions), SBI PO Mains (3–4 sets, 15–20 questions), RBI Grade B (high complexity sets), and IBPS Clerk Mains. It consistently has the lowest attempt rate in the exam — not because it is mathematically harder, but because most candidates never learn a systematic approach to reading paragraphs as data.

The math in caselet DI is identical to regular DI — percentages, ratios, averages, and basic arithmetic. The entire challenge is the first step: converting a paragraph into a usable data structure. Once you have done that, the questions become straightforward.

This guide gives you a complete, repeatable system for every type of caselet DI you will encounter in banking exams.

Part 1: Why Caselet DI Feels Hard — And Why It Is Not

The difficulty in caselet DI is entirely perceptual. When candidates see a long paragraph with numbers scattered through it, two things happen:

Problem 1 — Information overload: The paragraph contains more information than can be held in working memory simultaneously. Candidates try to remember all values while reading, get confused, and lose track halfway through.

Problem 2 — No visual anchor: With a table, you always know where a value is. With a paragraph, you have to search back through the text every time you need a number — which is slow and error-prone.

The solution to both problems is identical: Build a table before answering any question. Every single time. Without exception.

A caselet paragraph that takes 3 minutes to navigate with back-and-forth reading takes 45 seconds to read once if you are writing a table as you read. The table becomes your visual anchor, and the rest is standard DI.

Part 2: The 4-Step Caselet DI System

This is the complete method. Apply it to every caselet DI set regardless of topic or complexity.

Step 1 — Identify the Structure (10 seconds)

Before reading the numbers, read the paragraph to understand:

• What entity is being described? (A company, a school, a population, a set of students)
• What are the categories? (Departments, gender, grades, products, years)
• What is the total? (Always stated — find it first)

The total is the anchor of every caselet. Highlight or write it down immediately.

Step 2 — Build a Blank Table (15 seconds)

Draw a table with:

• Rows = categories (Male/Female, Department A/B/C, Product 1/2/3)
• Columns = sub-categories or attributes (Total, %, Sub-group values)

Leave cells blank. You will fill them in as you read.

Standard table structure for a 2-category caselet:

Step 3 — Fill the Table While Reading (60–90 seconds)

Read the paragraph slowly exactly once. For each number you encounter:

• Identify which cell it belongs to
• Write it in that cell immediately
• If it is a percentage, convert to actual value using the total (if total is known)

Critical rule: Fill absolute values in the table, not percentages. Percentages are intermediate steps — absolute values are what you need for calculation.

Step 4 — Solve Questions from the Table (30–45 seconds each)

Once the table is complete, treat it exactly like a regular DI table. All standard percentage, ratio, and comparison shortcuts apply.

Part 3: Caselet Type 1 — Single Entity with Multiple Categories

This is the most common caselet format in IBPS PO Prelims. One entity (a company, school, or group) is described with multiple sub-categories.

Worked Example

"A school has 800 students. 55% of the students are boys. Out of the boys, 40% play cricket, 35% play football, and the remaining play badminton. Out of the girls, 50% play cricket, 30% play badminton, and the remaining play football."

Step 1 — Identify structure:
Entity: School | Categories: Boys, Girls | Sub-categories: Cricket, Football, Badminton | Total: 800

Step 2 — Build blank table:

Step 3 — Fill while reading:

Total students = 800
Boys = 55% of 800 = 440
Girls = 800 − 440 = 360

Boys:

• Cricket = 40% of 440 = 176
• Football = 35% of 440 = 154
• Badminton = 440 − 176 − 154 = 110

Girls:

• Cricket = 50% of 360 = 180
• Badminton = 30% of 360 = 108
• Football = 360 − 180 − 108 = 72

Completed Table:

Now solve questions directly from the table:

Q1: How many students play football?
= 154 + 72 = 226 ✓ (read directly from Total row)

Q2: What percentage of girls play football?
= 72 ÷ 360 × 100 = 20%

Q3: Cricket players are what percentage more than badminton players?
= (356 − 218) ÷ 218 × 100 = 138 ÷ 218 × 100
≈ 138 ÷ 220 × 100 ≈ 63.3%

Q4: What is the ratio of boys playing cricket to girls playing badminton?
= 176 : 108 = 44 : 27 (divide both by 4)

Q5: How many boys play either cricket or badminton?
= 176 + 110 = 286

Total time for this set: ~3.5 minutes. Without a table: 6–8 minutes with errors.

Part 4: Caselet Type 2 — Two Entities Compared Across Categories

This format appears in IBPS PO Mains and SBI PO. Two companies, two years, or two groups are compared across multiple attributes.

Worked Example

"Company A has 1,200 employees and Company B has 900 employees. In Company A, the ratio of male to female employees is 3:1. In Company B, 60% of employees are male. In Company A, 25% of males and 40% of females have postgraduate degrees. In Company B, 30% of males and 50% of females have postgraduate degrees."

Step 1 — Identify structure:
Entities: Company A, Company B | Categories: Male, Female | Attribute: Postgraduate degree | Totals: 1200, 900

Step 2 — Build blank table:

Step 3 — Fill while reading:

Company A:

• Total = 1200, Male:Female = 3:1
• Male = 3/4 × 1200 = 900, Female = 300
• PG Male = 25% of 900 = 225
• PG Female = 40% of 300 = 120
• Total PG = 225 + 120 = 345

Company B:

• Total = 900, Male = 60% = 540, Female = 360
• PG Male = 30% of 540 = 162
• PG Female = 50% of 360 = 180
• Total PG = 162 + 180 = 342

Completed Table:

Questions:

Q1: What percentage of Company A employees have postgraduate degrees?
= 345 ÷ 1200 × 100 = 28.75%

Q2: What is the ratio of total PG employees in Company A to Company B?
= 345 : 342 = 115 : 114

Q3: Female employees in Company B are what percentage more than in Company A?
= (360 − 300) ÷ 300 × 100 = 60/300 × 100 = 20%

Q4: How many total male employees are there across both companies?
= 900 + 540 = 1,440

Part 5: Caselet Type 3 — Multi-Level Nested Data

This is the hardest caselet type — appears in SBI PO Mains and RBI Grade B. The paragraph gives data at multiple levels: a total, then sub-groups of that total, then sub-groups of those sub-groups.

Worked Example

"A survey was conducted on 2,000 people. 45% were from urban areas and the rest from rural areas. Out of urban people, 60% were employed and the rest unemployed. Out of rural people, 40% were employed. Among employed urban people, 70% were male. Among unemployed urban people, 55% were male. Among employed rural people, 65% were male."

Step 1 — Identify structure:
This is a 3-level caselet: Total → Area → Employment → Gender

Step 2 — Build tree structure first, then convert to table:

2000
├── Urban: 900
│   ├── Employed: 540
│   │   ├── Male: 378
│   │   └── Female: 162
│   └── Unemployed: 360
│       ├── Male: 198
│       └── Female: 162
└── Rural: 1100
   ├── Employed: 440
   │   ├── Male: 286
   │   └── Female: 154
   └── Unemployed: 660

Step 3 — Calculate level by level:

Level 1:

• Urban = 45% of 2000 = 900
• Rural = 1100

Level 2:

• Urban Employed = 60% of 900 = 540
• Urban Unemployed = 360
• Rural Employed = 40% of 1100 = 440
• Rural Unemployed = 660

Level 3:

• Urban Employed Male = 70% of 540 = 378, Female = 162
• Urban Unemployed Male = 55% of 360 = 198, Female = 162
• Rural Employed Male = 65% of 440 = 286, Female = 154

Completed Table:

Questions:

Q1: What is the total number of employed males across both areas?
= 378 + 286 = 664

Q2: Employed urban females are what percentage of total urban people?
= 162 ÷ 900 × 100 = 18%

Q3: What is the ratio of rural employed to urban unemployed?
= 440 : 360 = 11 : 9

Q4: Total employed people are what percentage of the total surveyed?
= (540 + 440) ÷ 2000 × 100 = 980/2000 × 100 = 49%

Part 6: The Most Common Caselet Traps

Trap 1 — "Remaining" Means Subtract, Not a New Percentage

When the paragraph says "the remaining play badminton" — this means subtract all other given values from the total. Do NOT treat it as a separate percentage.

Wrong approach: Treating "remaining" as ~25% based on pattern
Correct approach: 100% − 40% − 35% = 25% exactly → then convert to value

Trap 2 — Percentage of Sub-Group vs. Percentage of Total

"30% of males have a degree" means 30% of the male total — NOT 30% of the overall total.

Always note which base the percentage refers to before calculating.

Trap 3 — Ratio Given Instead of Percentage

When the paragraph gives a ratio (Male:Female = 3:2) instead of a percentage:

• Total parts = 3 + 2 = 5
• Male = 3/5 of total, Female = 2/5 of total

Convert ratio to fraction immediately before building the table.

Trap 4 — Two Different Totals in One Set

Some advanced caselets describe two separate entities (two companies, two cities) with different totals. Keep each entity's calculations completely separate — never mix values from one with percentages from the other.

Part 7: Speed Techniques for Caselet Calculation

Converting Percentages to Values Instantly

For caselet DI, you repeatedly compute X% of a fixed total. Pre-compute 10%, 5%, and 1% of the total once at the top of your rough work sheet. Then build any other percentage from those.

Example: Total = 1,200

• 10% = 120
• 5% = 60
• 1% = 12
• 25% = 120 × 2 + 60 = 300 (2 steps, not a fresh calculation)
• 35% = 120 × 3 + 60 = 420
• 45% = 120 × 4 + 60 = 540

Ratio to Absolute Value — One-Step Method

Ratio a:b with total T:

• First part = a/(a+b) × T
• Shortcut: Total ÷ (a+b) = one unit. Multiply by a or b.

Example: Ratio 3:5, total 640

• One unit = 640 ÷ 8 = 80
• First part = 80 × 3 = 240, Second = 80 × 5 = 400

"What Percentage More" vs. "What Percentage Of"

These two question types use different formulas — confusing them is the most common calculation error in caselet DI.

Exam-Wise Caselet DI Expectations

3-Week Caselet DI Practice Plan

The one non-negotiable rule: Always build the complete table before answering Question 1. Even if it feels slower initially, this habit reduces total set time by 30–40% within two weeks of practice.