Question 1
Five subjects are scheduled on five different days of the week (Monday to Friday), one subject per day. The following information is given:
- Biology is scheduled on Wednesday
- Chemistry is scheduled immediately after Mathematics
- There are exactly two classes between English and Physics
- Mathematics is not on Monday
On which day is Chemistry scheduled?
Step-by-step solution:
Table Method:
1. Create a timeline for Monday to Friday
2. Apply direct constraints:
- Biology is on Wednesday (fixed)
- Mathematics is not on Monday
3. Apply consecutive constraint:
- Chemistry immediately follows Mathematics
- Possible pairs: (Tue-Wed), (Wed-Thu), (Thu-Fri)
- Since Wednesday is occupied, options are (Tue-Wed) or (Thu-Fri)
4. Apply gap constraint:
- Two classes between English and Physics
5. Final schedule:
- Monday: English
- Tuesday: Mathematics
- Wednesday: Biology
- Thursday: Chemistry
- Friday: Physics
Answer: Chemistry is scheduled on Thursday
Key Strategy: Fix direct constraints first, then work with consecutive and gap constraints.
Table Method:
1. Create a timeline for Monday to Friday
2. Apply direct constraints:
- Biology is on Wednesday (fixed)
- Mathematics is not on Monday
3. Apply consecutive constraint:
- Chemistry immediately follows Mathematics
- Possible pairs: (Tue-Wed), (Wed-Thu), (Thu-Fri)
- Since Wednesday is occupied, options are (Tue-Wed) or (Thu-Fri)
4. Apply gap constraint:
- Two classes between English and Physics
5. Final schedule:
- Monday: English
- Tuesday: Mathematics
- Wednesday: Biology
- Thursday: Chemistry
- Friday: Physics
Answer: Chemistry is scheduled on Thursday
Key Strategy: Fix direct constraints first, then work with consecutive and gap constraints.