IQ tests are very popular on the Internet. It is believed that they can show the level of a person's mental development in numbers. The average IQ of an adult is from 85 to 115 points. The founder of Microsoft Bill Gates has an IQ of 170 points. And the greatest physicist Albert Einstein could have had an IQ of 190 points, but this is only an assumption, because the scientist never took an IQ test. Usually, IQ tests consist of dozens of logic problems with increasing difficulty. It takes about half an hour or even more to complete them. But there is a test that consists of only three questions and is solved much faster.

Contents

- 1 A difficult IQ test
- 2 Take an IQ test for free
- 2.1 A problem about a bat and a ball
- 2.2 A problem about making parts
- 2.3 A problem about water lilies in a lake

- 3 Answers to the IQ test
- 3.1 How much does a ball cost if the bat is a dollar more expensive
- 3.2 How many minutes does it take for 100 machines to create 100 parts?
- 3.3 How many days does it take for water lilies to cover half of a lake?

## A Complex IQ Test

The fastest IQ test in the world was developed in 2005. It was created by American professor Shane Frederick, who worked at the Massachusetts Institute of Technology. It contains only three mathematical questions aimed at intuitive reactions and other human thought processes.

Once, a group of 3,428 volunteers were given the test. Surprisingly, only 17% of the participants were able to find the correct answers to the problems. It turned out that in order to solve them, you need to discard the very first options, and then think carefully again.

## Take the IQ test for free

You can take the shortest IQ test right now. We have written three questions below – read them and write down the answers on a piece of paper or another place convenient for you. The answers are below, so for the purity of the result, do not peek!

### The bat and ball problem

A bat and ball set costs $1.10. How much does the ball cost if the bat is $1 more expensive?

### The problem about manufacturing parts

A factory has 5 machines that manufacture 5 parts in 5 minutes. How many minutes will it take 100 machines to manufacture 100 parts?

### Water Lilies in a Lake Problem

There are water lilies growing in a lake, and they double every day. If they cover the entire lake in 48 days, how many days will it take them to cover half of the lake?

**Must Read:** Do IQ Tests Really Measure Intelligence?

## IQ Test Answers

Many people may find this test extremely simple and straightforward. But each question has a catch, which causes the calculation to go wrong from the very beginning. Below you will see the solution to the IQ test questions and, most likely, you will be surprised.

### How much does a ball cost if the bat is a dollar more expensive

At first, the answer to this question seems obvious – most people immediately answer that a baseball costs 10 cents. The answer seems logical, but to find the correct answer, you need to solve a small equation.

Let the ball cost X dollars. Then it turns out that the bat costs x + $ 1.

Based on the conditions of the problem, the total cost of the set is x + (x + 1) = $ 1.10.

The solution to the equation looks like this:

2x + 1 = 1.10

2x = 1.10 − 1

2x = 0.10

x = 0.10/2

x = 0.05

That is, a baseball costs 5 cents, and a bat costs $1.05.

### How many minutes does it take for 100 machines to make 100 parts

After reading the problem, many people intuitively think that 100 machines make 100 parts in 100 minutes. This is the wrong solution.

If a factory has 100 simultaneously working machines, each of which makes 1 part in 5 minutes, then it will still take 5 minutes to make 100 parts.

### How many days does it take for water lilies to cover half of a lake

If water lilies completely cover a lake in 48 days, then it seems obvious that they fill half of it in 24 days. But the answer is not so obvious, attention to detail is important.

Given that the water lilies double every day and cover the entire lake in 48 days, then the day before, on the 47th day, they covered half the lake. Thus, the water lilies will cover half the lake in 47 days.

As you can see, the tasks in the fastest IQ test are formulated in such a way that their deceptive simplicity encourages incorrect answers. Most people, wanting to give an answer faster, do not see the catch and solve the test incorrectly. If you managed to solve at least one problem correctly, this is good news – you have well-developed cognitive reflexivity. This is the name for a person's ability to resist impulsive actions.

**Were you able to find the correct answers?** Share your results in our Telegram chat!

Of course, the Shane Frederick test cannot be called a full-fledged test for determining a person's IQ. This term was first introduced in 1912 by the German scientist Wilhelm Stern. Since then, many IQ tests have appeared, many of which are available online. But before making a decision, you need to make sure that the test is free – it happens that a person spends half an hour or more to take it, and then cannot see the results without spending money.