[Quiz] Can You Pass The World’s Shortest IQ Test?

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Can you correctly answer the Cognitive Reflection Test? In a survey of 3,428 people, an astonishing 33 percent missed all three questions. Most people–83 percent–missed at least one of the questions. Three questions separate you from being of average intelligence and full-blown brainiac— but are they as easy as they seem?




1. A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?

1. A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?

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2. If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

2. If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

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?

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?

[Quiz] Can You Pass The World’s Shortest IQ Test?