Top secret
Maths investigation
The Case of the Missing Mathematical Medallion
Case file no. 0817
Suspects
4
Evidence
4
Time
40 min
Your mission
- Examine the evidence.
- Solve the maths missions.
- Find the four digits.
- Open the safe.
- Reveal the thief.
Investigation centre
Evidence in the case
Solve the four missions, collect the digits and unlock the safe.
Progress
0 of 4
Safe code
_
_
_
_
Evidence 1
Museum floor plan
Reconstruct the route
The system has saved four coordinates. Plot the points in the right order and follow the suspect’s route.
Museum staff map
Waiting for points
Coordinate grid
North wing
West wing
Central wing
East wing
South wing
Click the points in order:
A → B → C → D
Coordinates received
A
(1, 5)
B
(3, 5)
C
(3, 2)
D
(5, 2)
System data
Selected points
No points selected yet.
Which wings does the route pass through?
You can choose more than one answer.
Evidence confirmed
The route passes through three different wings.
First digit of the code: 3
Evidence 2
Analysis of the electronic passes
Check the activity in the museum
The access system recorded the number of entries over the last four days. Compare the usual activity with the data from the day of the incident.
Access control system
System active
Entry report
Day
Number of entries
Monday
18
Tuesday
22
Wednesday
20
Thursday
24
Day of the incident
35 entries
Find out whether the activity was unusually high.
Investigation analysis
Analyse the data
Mean
Sum of the data ÷ number of days
What can you conclude?
Choose the statement that is supported by your calculations.
Evidence confirmed
The difference is greater than 10. Unusual activity was recorded on the day of the incident.
Second digit of the code: 2
Evidence 3
Damaged security camera recording
Restore the time
Part of the time stamp is damaged. Solve the equation to find the missing minutes.
Central Exhibition Hall
14:
??
Partly damaged time stamp
Recovery code
4(x – 3) – 2(x + 1) = x – 2
Maths analysis
Solve the equation
1
2
3
x =
14:
The value of x gives the minutes of the damaged recording.
Recording restored
The security camera recorded movement at 14:12.
Third digit of the code: 2
Evidence 4
List of cards used
Analyse the access system
The system saved every use of cards and keys between 13:30 and 15:00. Find out which type of access was used most often around the time of the incident.
Access control system
Archive record
Report 13:30 – 15:00
System note
The report includes every zone that the restored route passed through.
Final access analysis
Choose the key clue
Click the row of the card or key used most often around the time of the incident.
Selected access type
No record selected yet
What can you conclude?
Evidence confirmed
The high-level access card was used most often around the time of the incident.
Fourth digit of the code: 4
Secure archive
All four clues have been collected
Unlock the safe
Enter the four-digit code from the maths evidence. With the correct code, you will get access to the suspects’ case files.
MUSEUM SECURITY SYSTEM
Warning
Three wrong attempts will activate a security pause.
Combination lock
Enter the code
Use the digits from your code sheet.
Attempts left:
3
Access granted
The safe is unlocked
The code is correct. You now have access to the confidential files on the four suspects.
Confidential archive
Final stage of the investigation
Who stole the medallion?
Compare the route, the time of the incident, the type of access used and the information in the case files. Then name the thief and defend your conclusion.
Recovered data
Key clues from the investigation
Evidence 1
Route
North, Central and East wings
Evidence 2
Unusual activity
35 entries compared with a mean of 21
Evidence 3
Time of the incident
Restored recording: 14:12
Evidence 4
Access used
High-level card – used 4 times
Investigation report
Final conclusion
Choose a suspect and select the evidence that supports your decision.
Chosen thief
No suspect chosen yet
Case solved
Mission completed successfully
The medallion has been found
Excellent work, detective . You used the mathematical evidence to reveal the thief.