Cognitive Reflection Test Basic 2 — Questions and Answers
Question 1: A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?
- $0.05 (Correct answer)
- $0.10
- $1.00
- $0.15
Correct answer: $0.05
If the ball is $0.05, the bat is $1.05 (one dollar more), summing to $1.10.
Question 2: If 5 machines take 5 minutes to make 5 widgets, how long would 100 machines take to make 100 widgets?
- 5 minutes (Correct answer)
- 100 minutes
- 20 minutes
- 500 minutes
Correct answer: 5 minutes
Each machine makes one widget in 5 minutes, so 100 machines make 100 widgets in the same 5 minutes.
Question 3: In a lake, a patch of lily pads doubles in size every day. If it takes 48 days to cover the whole lake, how long to cover half the lake?
- 47 days (Correct answer)
- 24 days
- 46 days
- 12 days
Correct answer: 47 days
Since the patch doubles daily, the day before full coverage it covered exactly half.
Question 4: What is the primary cognitive ability the Cognitive Reflection Test measures?
- Suppressing an intuitive wrong answer to find the reflective correct one (Correct answer)
- Raw arithmetic speed
- Vocabulary size
- Short-term memory span
Correct answer: Suppressing an intuitive wrong answer to find the reflective correct one
The CRT gauges whether a person overrides a fast, wrong gut response with deliberate reasoning.
Question 5: Who introduced the Cognitive Reflection Test in 2005?
- Shane Frederick (Correct answer)
- Daniel Kahneman
- Amos Tversky
- Keith Stanovich
Correct answer: Shane Frederick
Shane Frederick published the original three-item CRT in 2005.
Question 6: If John can drink one barrel of water in 6 days, and Mary in 12 days, how long to drink one barrel together?
- 4 days (Correct answer)
- 9 days
- 6 days
- 3 days
Correct answer: 4 days
Their combined rate is 1/6 + 1/12 = 1/4 barrel per day, so together they finish in 4 days.
Question 7: Jerry received both the 15th highest and the 15th lowest mark in the class. How many students are in the class?
- 29 (Correct answer)
- 30
- 15
- 31
Correct answer: 29
There are 14 above and 14 below Jerry, plus Jerry himself, totaling 29.
Cognitive Reflection Test Basic 2
A bat and a ball cost $1.10 in total.
The bat costs $1.00 more than the ball.
How much does the ball cost?