Think quickly: can you ace the world's shortest intelligence test?

College academics math By Andrey K. Below is the world's shortest intelligence test. See how many questions you can answer!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?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?This is Shane Frederick's Cognitive Reflection Test. Although the test is simply worded and only has four possible scores, when it was given to groups of students at various universities, it correlated fairly well to other, longer intelligence tests. (For reference, students from MIT averaged 2.18 correct answers.) The neat part is that the questions in the test are designed to trick you. They all have nice, intuitive answers which spring right to...