The shortest IQ test in the world but only 17% of Harvard and Princeton students pass

The shorter the answer, the higher your IQ will be. However, you may be an impatient person if you answer these IQ tests incorrectly.

Currently, Cognitive Reflection Test (CRT - Cognitive Reflection Test) is the world's shortest IQ test, developed by psychologist Shane Frederick of Princeton University in 2005. There are only 3 questions, but it Designed to classify geniuses and ordinary people within seconds.

Basically, these questions are very easy, and anyone can answer correctly if they really think seriously. However, speed is also an important issue, because the right answer in a short time, you are recognized as a genius.

Answering correctly in a short time, you are recognized as a genius.

Question

1. Lost $ 1.1 to buy a baseball and a baseball. The pestle is more expensive than the $ 1 ball. How much does the ball cost?
2. 5 machines take 5 minutes to make 5 devices. So how long does it take 100 machines to make 100 devices?
3. There's a bunch of algae in the lake. Every day, the area of ​​algae blooms doubles. After 48 days, the algae cover the lake surface. How many days will it take for algae to cover half of the lake surface?

Try to see if you can get through. According to one study, only 17% of students from Yale and Harvard can answer CRT perfectly - that is, both fast and accurate.

Answer

1. The big possibility you will answer is $ 0.1, or 10 cents. But the answer is only 5 cents, or $ 0.05. According to research from Princeton, people who immediately give out 10-cent answers tend to be more impatient than the right respondents.
2. 5 machines take 5 minutes to make 5 devices, then 1 machine also takes 5 minutes to make 1 product and 100 machines also take 5 minutes to make 100 devices only.
3. 24 days is your answer? No. If algae double the area every day, we only need 1 day to cover algae from half a lake to the lake. Answer is 47.