we all worry **find out how smart we are**, and whoever says no is surely lying. For this reason, doctors and psychologists have designed different tests so that we can know which one is ours **intelligence quotient**.

## What is IQ

IQ is a** number used to measure intelligence** by each person. To know this number, various tests are carried out in which the mental age is usually evaluated, on the one hand, and, on the other, the chronological age. It is from this data that the IQ is calculated. **(IQ or IQ)**.

In general, to measure IQ, there is usually one question **series of trials** which include problems of** linguistic, spatial, mathematical and logical**among others, it describes *www.educalive.com*.

## A new (and fast) test

As we said, there are different ways or tests to measure our intelligence. They are all generally** fairly broad ratings** and with so many questions, which really put our brain to the test.

Luckily, if we don’t have enough time to do such a long test, there is a **solution**stands out *The mirror*.

Is that this test, which is considered **“the shortest IQ test in the world”**, includes only three questions. But we must not be fooled, because although it may seem relatively simple, it is complicated and **only 17 percent of those who took it were able to complete it successfully**.

## The “cognitive reflection test”

This questionnaire is not new: it was originally included in a research paper done in 2005 by MIT professor Shane Frederick. But the document recently resurfaced online and **It has become a viral phenomenon. **

As part of his research, Frederick had more than **3000 participants** from a variety of educational backgrounds will complete the test. This sample included those who attended top US universities, such as **Yale **AND **harvard** that they too were having a hard time solving the three problems, the outlet highlighted.

Of all those who took part, only 17 percent managed to score three out of three out of three on the test, meaning that the **83% of people have failed.**

“The three points of the test are ‘easy’ in the sense that their solution is easily understood once explained, but getting to the correct answer often requires suppressing a **wrong answer that arises ‘impulsively in the mind**explained Professor Frederick.

## The test: dare to do it!

**Question 1:** A bat and ball cost a total of $1.10. The bat costs $1 more than the ball. How much is the ball?

**Question 2:** If it takes five machines five minutes to make five items, how long would it take 100 machines to make 100 items?

**Question 3:** In a lake there is a lotus bed. Every day the massif doubles in size. If the massif takes 48 days to cover the entire lake, how long will it take to cover half the lake?

## The 3 most common (but incorrect) answers.

**Answer 1:** 10 cents.

**Answer 2:** 100 minutes.

**Answer 3:** 24 days.

“Anyone who reflects on this, even for a moment, will recognize that the difference between $1 and 10 cents is only 90 cents, not $1 as the issue indicates,” Frederick said according to* The mirror*.

He added, “In this case, catching that mistake is tantamount to solving the problem, as nearly everyone who doesn’t answer ’10 cents’ gives the correct answer.”

## What are the correct answers

**Answer 1:** 5 cents

**Answer 2:** 5 minutes

**Answer 3: **47 days

Baffled? Luckily, Presh Talwalkar, the author of *“Game Theory Today: An Introduction to Strategic Thinking”* explained** how to find the right answers** on his blog “*Be careful with your decisions” *(“Look at your decisions”, in Spanish).

**Answer 1:** Let’s say the ball costs X. So the bat costs $1 more, so it’s X + 1. So we have bat + ball = X + (X + 1) = 1.1 because together they cost $1.10. That means 2X + 1 = 1.1, so 2X = 0.1, so X = 0.05. That means the ball costs 5 cents and the bat costs $1.05.

**Answer 2:** If 5 machines take 5 minutes to make 5 items, then 1 machine takes 5 minutes to make 1 item (each machine makes 1 item in 5 minutes). If we have 100 machines working together, each one can make an object in 5 minutes. So there will be 100 objects in 5 minutes.

**Answer 3:** Every day forward the massif doubles in size. Then each day backwards is cut in half. So on day 47 the lake is half full.

Source: Clarin