This page covers SSC CHSL Scheduling / Day-Month Puzzle with complete concept notes, 21 graded practice MCQs, key points and exam-specific tips. Free to study.
Every puzzle has conditions that must be satisfied. Read all conditions first. Look for direct clues (like 'A meets on Monday') and indirect clues (like 'B meets two days after C'). Use elimination method to narrow down possibilities
→Three Main Types
1) Day-wise scheduling (7 days of week), 2) Month-wise scheduling (12 months), 3) Date-wise scheduling (1-31 dates). Each type follows similar solving patterns but has different reference points
🔑Formula for Gap Calculation
If X meets 'n' days after Y, and Y is on day 'd', then X is on day 'd+n'. For circular arrangements (like days of week), use modulo 7. If result exceeds 7, subtract 7.
📊
Exam Patterns
What examiners ask — read before attempting PYQs
⚡Powerful Shortcut
Create a possibility chart. List all people vertically and all days/months horizontally. Mark 'YES' for confirmed positions and 'NO' for impossible ones. This visual method prevents confusion and speeds up solving
✏️Worked Example 1
Six friends A, B, C, D, E, F meet on different days of the week starting Monday
→Conditions
1
Place direct clues. B = Wednesday, E = Sunday (last day).
2
F meets immediately before B, so F = Tuesday.
3
From condition 1, if C = Monday, then A = Wednesday. But B is already on Wednesday. So C cannot be Monday.
4
If C = Thursday, then A = Saturday
🔑Check condition 3
D must be between C and A, so D = Friday. This works!
Step 5: Remaining person goes to remaining day. So the arrangement is: Monday = (remaining), Tuesday = F, Wednesday = B, Thursday = C, Friday = D, Saturday = A, Sunday = E
✏️Worked Example 2
1
P = April (given).
2
Since S meets immediately after R, and S meets in a 30-day month, possible months for S are April, June, September, November.
3
S cannot be April (P is there). If S = June, then R = May
🔑Check
Q meets two months before R means Q = March. This works!
Step 4: Final arrangement: Q = March, P = April, R = May, S = June.
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⚠️Most Common Mistake
Students confuse 'after' and 'before'. If A meets 2 days after B, it means A's day comes later than B's day. Many students reverse this relationship. Always draw a timeline to avoid confusion.
Another frequent error is miscounting gaps. 'Two days after Monday' means Wednesday, not Tuesday
→Count carefully
Monday (start) → Tuesday (1 day after) → Wednesday (2 days after).
Test Scheduling / Day-Month Puzzle under exam conditions
Ravi has a task schedule for a week. He works on Monday, Wednesday, and Friday. He rests on Tuesday and Thursday. On Saturday, he works double shift. On Sunday, he rests. How many days does Ravi work in total during the week?
Practice 2easy
A library has opening hours from 9 AM to 6 PM on weekdays and 10 AM to 4 PM on weekends. If a student visits on Wednesday at 2 PM and stays for 3 hours, at what time does the student leave?
Practice 3easy
Five friends—Arun, Bhavna, Chetan, Diya, and Esha—are scheduled to give presentations on five consecutive days: Monday to Friday. Based on the following clues, on which day does Chetan give his presentation?
Clue 1: Arun presents on Monday.
Clue 2: Bhavna presents the day after Arun.
Clue 3: Chetan presents two days after Bhavna.
Clue 4: Diya presents on Friday.
Clue 5: Esha presents on the remaining day.
Practice 4easy
Four tasks—A, B, C, and D—are scheduled across four weeks: Week 1, Week 2, Week 3, and Week 4. Each task is assigned to exactly one week. Based on the clues, in which week is task C scheduled?
Clue 1: Task A is scheduled in Week 1.
Clue 2: Task B is scheduled in the week immediately after task A.
Clue 3: Task C is scheduled in the week immediately before task D.
Clue 4: Task D is not scheduled in Week 1.
Practice 5easy
Five events—E1, E2, E3, E4, and E5—occur on five consecutive days starting from Monday. Based on the clues, on which day does E3 occur?
Clue 1: E1 occurs on Monday.
Clue 2: E2 occurs two days after E1.
Clue 3: E4 occurs one day after E2.
Clue 4: E5 occurs on Friday.
Clue 5: E3 occurs on the remaining day.
Practice 6easy
Six meetings—M1, M2, M3, M4, M5, and M6—are scheduled on six different dates in a month: the 3rd, 8th, 13th, 18th, 23rd, and 28th. Based on the clues, on which date is M3 scheduled?
Clue 1: M1 is scheduled on the 3rd.
Clue 2: M2 is scheduled on the 8th.
Clue 3: M4 is scheduled exactly 10 days after M2.
Clue 4: M5 is scheduled on the 28th.
Clue 5: M6 is scheduled on the 23rd.
Clue 6: M3 is scheduled on the remaining date.
Practice 7easy
A train schedule shows departures at 8:00 AM, 10:30 AM, 1:15 PM, and 4:45 PM. If a passenger arrives at the station at 11:00 AM, which is the next train the passenger can catch?
Practice 8easy
Four friends—Aman, Bina, Chetan, and Diya—have meetings scheduled on different days of a week (Monday to Thursday). Aman's meeting is on Tuesday. Bina's meeting is two days after Aman's. Chetan's meeting is on the day before Bina's. Diya's meeting is on Monday. On which day is Chetan's meeting scheduled?
Practice 9easy
A project has deadlines on the 5th, 12th, 18th, and 25th of a month. If today is the 3rd of the month, how many deadlines are still pending (including today)?
Practice 10easy
Five friends — Aman, Bhavna, Chirag, Diya, and Ertika — have scheduled their doctor appointments on five different days of the same week (Monday to Friday). Using the clues below, determine on which day does Chirag have his appointment?
Clues:
1. Aman's appointment is on Wednesday.
2. Bhavna's appointment is 2 days after Aman's.
3. Diya's appointment is on the day immediately before Ertika's.
4. Chirag's appointment is not on Monday and not on Friday.
5. Diya's appointment is before Chirag's appointment.
Practice 11medium
Five employees—Arun, Bhavna, Chitra, Deepak, and Esha—are scheduled for meetings on five consecutive days: Monday through Friday. Each person meets exactly once. Based on the following clues, on which day does Chitra have her meeting?
1. Arun's meeting is on Wednesday.
2. Bhavna's meeting is exactly two days before Esha's meeting.
3. Deepak's meeting is on Friday.
4. Chitra's meeting is not on Monday or Tuesday.
Practice 12medium
Four friends—Aman, Bina, Chetan, and Diya—are born in four different months: January, April, July, and October. Based on the following clues, in which month is Chetan born?
1. Aman is born in January.
2. Bina is born exactly three months before Diya.
3. Chetan is not born in January or October.
Practice 13medium
Five events—A, B, C, D, E—are scheduled on five consecutive days: Monday through Friday. Each event occurs exactly once. Based on the following clues, on which day does event C occur?
1. Event A is on Wednesday.
2. Event B is on Monday.
3. Event D is exactly two days after event C.
4. Event E is not on Friday.
Practice 14medium
Seven tasks—1, 2, 3, 4, 5, 6, 7—are scheduled over seven consecutive days: Monday through Sunday. Each task is scheduled exactly once. Based on the following clues, on which day is task 4 scheduled?
1. Task 1 is scheduled on Monday.
2. Task 3 is scheduled on Friday.
3. Task 5 is scheduled exactly two days after task 2.
4. Task 4 is scheduled before task 5.
5. Task 6 is scheduled on Sunday.
Practice 15medium
Six tasks—P, Q, R, S, T, U—are scheduled over six consecutive weeks: Week 1 through Week 6. Each task is scheduled exactly once. Based on the following clues, in which week is task R scheduled?
1. Task P is scheduled in Week 3.
2. Task Q is scheduled exactly three weeks before task T.
3. Task S is scheduled in Week 5.
4. Task R is scheduled after task Q but before task T.
Practice 16hard
Six tasks—P, Q, R, S, T, U—must be completed on six consecutive days: Monday through Saturday. Each task is assigned to exactly one day. Based on the following clues, on which day is task R scheduled?
1. Task P is scheduled on Wednesday.
2. Task Q is scheduled exactly 3 days after task S.
3. Task T is scheduled on Friday.
4. Task R is scheduled before task Q.
5. Task U is scheduled on Saturday.
Practice 17hard
Five employees—Arun, Bhavna, Chitra, Deepak, and Esha—are scheduled for meetings on five consecutive days: Monday through Friday. Each person meets exactly once. Based on the following clues, on which day does Chitra have her meeting?
1. Arun's meeting is on Wednesday.
2. Bhavna's meeting is exactly 2 days before Deepak's meeting.
3. Esha's meeting is on Friday.
4. Chitra's meeting is not on Monday or Tuesday.
5. Deepak's meeting is not on Thursday.
Practice 18hard
Six tasks—P, Q, R, S, T, U—are scheduled over six weeks (Week 1 to Week 6). Each task is assigned to exactly one week. Based on the following constraints, in which week is task R scheduled?
1. Task P is scheduled in Week 3.
2. Task Q is scheduled exactly 2 weeks after task S.
3. Task T is scheduled in Week 1.
4. Task U is scheduled in Week 5.
5. Task R is scheduled before task Q.
6. Task S is not scheduled in Week 4.
Practice 19hard
Five friends — Arun, Bina, Chitra, Devi, and Eshaan — are scheduled to give presentations on five consecutive days: Monday to Friday. Each person presents on exactly one day, and no two people present on the same day.
The following conditions must be satisfied:
1. Arun presents on Wednesday.
2. Bina presents the day immediately after Chitra.
3. Devi presents on Friday.
4. Eshaan does not present on Monday.
5. Chitra presents before Arun.
On which day does Eshaan present?
Practice 20hard
Eight employees—Aman, Bhavna, Chitra, Deepak, Esha, Faisal, Gita, Hira—are assigned to eight consecutive time slots (Slot 1 to Slot 8) for interviews. Each employee occupies exactly one slot. Based on the following constraints, in which slot is Chitra assigned?
1. Aman is in Slot 4.
2. Bhavna is in Slot 2.
3. Esha is exactly 2 slots after Deepak.
4. Gita is in Slot 7.
5. Hira is in Slot 1.
6. Chitra is not in Slots 1, 2, 3, or 4.
7. Faisal is in Slot 6.
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