Brain Teasers
Gold Breakout
Someone has broken into one of the city's most secure bank vaults and stolen some gold bullion. Six suspects have been rounded up. Use the clues to try and narrow down the list of suspects.
The suspects are Alex, Beth, Charlotte, Dave, Emily, and Frank.
Clues:
1. A suspicious-looking masked person dressed in a black hoodie and thick trousers was seen with a bank certified tool kit labelled VAULT MAINTENANCE near the vault.
2. 200 lbs of gold was stolen; 100 lbs carried by each thief.
3. Emily and Dave are workers at the bank.
4. All the suspects are health and fitness fanatics except Dave and Beth.
5. The passages between the vault and the bank entrance are long, narrow, and it is easy to get lost in them.
6. Two people were seen from a distance running to the bank entrance carrying sacks.
7. All the suspects were informed that the theft happened on Saturday night.
8. Alex claimed to have been eating at the fast food place with his friends each evening from last Sunday to Saturday so he couldn't have done it.
9. Frank broke his arm a few days before the theft.
10. Charlotte works as a medical consultant and claimed that she was at home on Saturday night.
11. The bank is very secure.
12. Beth works as a receptionist.
Use the clues. Which of the suspects should be questioned further?
The suspects are Alex, Beth, Charlotte, Dave, Emily, and Frank.
Clues:
1. A suspicious-looking masked person dressed in a black hoodie and thick trousers was seen with a bank certified tool kit labelled VAULT MAINTENANCE near the vault.
2. 200 lbs of gold was stolen; 100 lbs carried by each thief.
3. Emily and Dave are workers at the bank.
4. All the suspects are health and fitness fanatics except Dave and Beth.
5. The passages between the vault and the bank entrance are long, narrow, and it is easy to get lost in them.
6. Two people were seen from a distance running to the bank entrance carrying sacks.
7. All the suspects were informed that the theft happened on Saturday night.
8. Alex claimed to have been eating at the fast food place with his friends each evening from last Sunday to Saturday so he couldn't have done it.
9. Frank broke his arm a few days before the theft.
10. Charlotte works as a medical consultant and claimed that she was at home on Saturday night.
11. The bank is very secure.
12. Beth works as a receptionist.
Use the clues. Which of the suspects should be questioned further?
Answer
Alex and Emily should be investigated further.Frank is unlikely to have done it since he broke his arm (clue 9) and the criminals were running carrying heavy amounts of gold (clues 2 and 6).
Beth is unlikely to have done it since she does not work out much (clue 4) and it might be difficult to carry a heavy amount of gold (clue 2) a long way (clue 5).
If Alex is one of the health and fitness fanatics (clue 4), what is the probability of him being at the fast food place for six consecutive evenings in a row? This statement is slightly suspicious and further investigation is required.
Since the bank is very secure (clue 11), and the passages between the vault and bank entrance are long and narrow (clue 5), Emily is a potential suspect. As the bank is secure, it would probably take an employee of the bank to get hold of the gold (Emily or Dave). Since Dave doesn't work out much (clue 4), it would be difficult for him to carry a heavy load of gold a long way while running (clue 6). That leaves Emily.
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