The world’s shortest IQ test only has three questions, but 80% of people fail


Do you consider yourself to be someone with a high IQ? Maybe you’re interested in knowing if you’re smart, but when it comes to taking a test, you realize you don’t have the time, patience, or energy?

Well, that’s where the world’s shortest IQ test really comes in handy, because it shouldn’t take too long to get answers.

It’s not a new test and has been around since a research paper was published in 2005 by Professor Shane Frederick, but it does resurface online from time to time, with more and more people following it. try.

Credit: Alamy

Professor Frederick has 3,000 participants completing the test and only 17% managed to get the maximum mark and get 3/3. Impressive.

So… what are we waiting for? Here are the questions:

1. A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the balloon cost?

2. If it takes five machines five minutes to make five widgets, how long would it take 100 machines to make 100 widgets?

3. In a lake, there is a patch of water lilies. Every day, the patch doubles in volume. If it takes 48 days for the plot to cover the entire lake, how long would it take for the plot to cover half of the lake?

Do you still have a headache? It’s not a matter of IQ.

Credit: Wiki Commons
Credit: Wiki Commons

People usually give the answers (in the order of the questions above) as 10 cents, 100 minutes, and 24 days.

Explaining why the former is incorrect, Professor Frederick said: “Anyone who thinks about it for even a moment would recognize that the difference between $1 and 10 cents is only 90 cents, not $1 as stated in the problem.

“In this case, catching that error is like solving the problem, since almost everyone who doesn’t answer ’10 cents’ actually gives the correct answer.”

What are the answers then? *drum roll, please*: 5 cents, 5 minutes and 47 days.

Credit: Alamy
Credit: Alamy

If your head keeps bumping into you, don’t worry. Presh Talwalkar explained the answers on his blog, Mind Your Decisions.

Describing the first question, he wrote: “Let’s say the ball costs X. Then 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, then 2X = 0.1, so X = 0.05. That means the ball costs 5 cents and the bat costs $1.05.

Regarding riddle number two, he continued, “If it takes 5 machines 5 minutes to create 5 widgets, then it takes 1 machine 5 minutes to create 1 widget (each machine makes a widget in 5 minutes) If we if 100 machines work together, each can create a widget in 5 minutes, so there will be 100 widgets in 5 minutes.

And for the final riddle, he said, “Every day FORWARD the patch doubles in size. So every day BACKWARD means the patch is halved. So on day 47 the lake is half full. “

Aaaaand, I’m going to lie down – knowing that I’m not as smart as that 11-year-old boy, who got the highest Mensa rating ever.


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