Cognitive Reflection Test (7-Item)

Cognitive Reflection Test (7-Item Version)

This expanded test measures your tendency to think reflectively rather than rely on quick, intuitive answers. Read each question carefully and select the correct answer from the options provided.

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?	$0.10 $0.05 $0.01 $0.15
2. If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?	100 minutes 5 minutes 500 minutes 10 minutes
3. In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?	24 days 47 days 48 days 46 days
4. If John can drink one barrel of water in 6 days, and Mary can drink one barrel of water in 12 days, how long would it take them to drink one barrel of water together?	9 days 4 days 18 days 6 days
5. Jerry received both the 15th highest and the 15th lowest score in his class. How many students are in the class?	30 29 15 31
6. A farmer has 10 trees. He wants to plant them in 5 rows, with 4 trees in each row. How many trees will he plant?	20 10 40 15
7. If you flipped a fair coin twice, what is the probability (in percentage) that you get heads both times?	50% 25% 75% 100%