[Genius if you can solve it?] Insight and intuition: a challenging IQ quiz
That instant when an idea pops into your head feels so good, doesn’t it? Why not try some IQ quizzes that train your intuition and creativity and enjoy that refreshing rush? Discovering the “Aha!” moment when you see the answer is part of the fun, too.
From wordplay and number tricks to puzzles that use the characteristics of kanji, a small shift in perspective can reveal the solution.
Take a short break in your day and enjoy IQ quizzes as a way to refresh your brain.
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Simple but Profound Logical Thinking and Trick-Style IQ Quizzes (11–20)
There are 200 fish. 99% are guppies. How many fish need to be removed to make 98% guppies?
See the answer
100 animals
There are 200 fish in total. Of those, 99% are guppies, which means there are 198 guppies and 2 non-guppies. If you want to make the guppies 98%, you have to reduce the number of guppies. Since there are 2 non-guppies, if you reduce the guppies from 198 by 100, you’ll have 98 guppies and 2 other fish, making it 98%. Reduce by 100 just to lower it by 1%? It might be surprising, but that’s the interesting part of this problem.
Which is heavier, 10 tons of iron or 10 tons of paper?
See the answer
Both are the same.
When you hear the words iron and paper, some people might feel that iron seems heavier at first glance. The key is to realize that the weight of 10 tons doesn’t change, so they’re the same weight. Don’t overthink the question—just compare the weight simply.
When you toss a 10-yen coin and it falls to the ground, what percentage is the probability that the side with the number faces up?
See the answer
100%
Some of you might have wondered about the probability of the side labeled “10” coming up. However, a 10-yen coin has both the Arabic numeral “10” and the kanji character “十” engraved on its two faces, so whichever side lands face up, a “number” is on top.
Five people are running. If you overtake the person in last place, what position do you become?
See the answer
Cannot overtake
For a moment, you might think, “So they become 4th place?”—but that’s exactly the trick in this quiz. The person running at the very back is the last person. In other words, there is no one behind them. Therefore, they can’t overtake anyone. It’s a simple yet brain-teasing quiz that requires flexible thinking.
The hot water I boiled in a kettle was gone after five hours. Why on earth did that happen?
See the answer
Because it had turned into water
Because five hours had passed since the water was boiled, it had cooled down and turned into water. The phrase “had disappeared” makes you think the hot water vanished somewhere, but the trick is noticing that its state had changed.
There are two incense sticks that each burn out in one hour. How can you use them to measure 45 minutes?
See the answer
Light three points simultaneously: one stick at one end, the other stick at both ends. When the first stick burns out, light the remaining end of the other stick.
An incense stick lit at both ends should burn out in 30 minutes. If you light one end first, by the time it has 30 minutes of burn time remaining, lighting the other end will make it burn twice as fast, so 30 ÷ 2 = 15 minutes, and everything will burn out in a total of 45 minutes.
In conclusion
A collection of unique IQ quizzes that tickle your intellectual curiosity and make you blurt out, “I see!” It’s not only a great chance to train your creativity and flashes of insight, but also a way to hone your intuition.
Because they’re quizzes, there’s nothing stiff or formal—every question lets you energize your brain while having fun.
Why not try them together with friends or family?