This is the shortest intelligence test in the world. It’s consisted of 3 questions only, and about 85 percent of people answer it incorrectly. These questions seem very easy and simple at first glance, but are in fact a challenging puzzle.


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Measure the performance of your cognitive thinking and answer these questions.

The Shortest IQ Test In The World, Testing Your Intelligence And Knowledge
  1. A ball and a bat cost a total of 1.10 dollars. The bat is a dollar more expensive than the ball. Do you know the price of the ball?
  2. 5 machines need 5 minutes to produce 5 gadgets. If we have 100 machines, in how much time will they produce 100 gadgets?
  3. One small portion of a lake is covered with water lilies. With every past day, the coverage of the lilies doubles in size. If they need 48 days to cover the entire surface of the lake, how many days will they need to cover only half?

Do you know the answers? How much time do you need to have each question cracked? In a survey, conducted on about 3,500 top grade students in the US, 33 percent gave a wrong answer to all 3 questions. 83 percent of them gave at least one wrong answer. At MIT, only 48 percent of the students gave correct answers to all 3 questions.

The Most Obvious Answers
  1. The ball is 0.10 dollars.
  2. In 100 minutes.
  3. 24 days.
Correct Answers
  1. The ball is 0.05 dollars. [0.05 + 1.05 = 1.10]
  2. In 5 minutes.
  3. 47 days.

This is a short psychological task, designed to test the ability of the human’s brain in realizing when a problem is more complex and harder than it seems at first glance. It’s known as CRT, short for Cognitive Reflection Test.

A Few More Tips On How To Improve Your Intelligence
  1. Good nutrition means healthy life, body and mind. Eat ‘brain foods’ rich in vitamins, carbohydrates and amino acids.
  2. Exercise regularly, to improve the supply of blood and oxygen to the brain.
  3. Have a good night’s sleep. Sleep deprivation can impair the brain areas of concentration, alertness, memory (short and long-term), and problem-solving.
  4. Moderate alcohol consumption. Alcohol abuse can impair the cognitive abilities of the brain. On the other hand, moderate drinking can help improve its functioning.
  5. Quit smoking. The toxins found in cigarettes are known to cause long-term damage to the cognitive thinking.
  6. Meditate. Meditation is a stress-relief technique that can help improve the attention, alertness and creativity.
  7. Challenge your brain with IQ tests. This is where our short IQ test might come in handy. Try to find similar tests on the Internet and challenge yourself. You can even expand your scope, and besides mathematical, try musical and visual tests. You can also try to learn a new language.

Try the world’s shortest IQ test: Just 3 questions
15 Ways to Increase Your Intelligence