A test that will trouble even the brightest minds: see if you can guess the missing number

This logic IQ test will test your attention, reasoning and logical thinking. At first glance, a simple picture hides a task that can be quite a challenge.

The human brain loves a challenge – it’s puzzles like this that activate the centres of concentration and creativity. Even a short exercise like this test can stimulate logical thinking and improve mental flexibility. Those who want to keep their minds in good shape can regularly solve logic problems, play board games, learn new languages or simply try to do things differently than usual. After all, the brain needs to get out of its routine from time to time to stay in shape.

What’s in store for you today?

In the picture you see three rows of numbers: the first 4-8-24, the second 3-6-18 and the last 5-10-?. The challenge here is obvious – to figure out the number behind the question mark. You may find it difficult at first, but believe me, all you have to do is think logically and you will understand the whole principle. Let’s give it a try.

The correct solution

The correct result is 30.

Note that there is a simple logic between the numbers in each row. In both the first and second rows, the second number is twice the first, and the third number is three times the second.

For example:
4 → 8 (x 2) and 8 → 24 (x 3).

Now just apply the same procedure to the last line: 5 × 2 = 10 and 10 × 3 = 30. So instead of a question mark, the number 30 belongs.

Try sending the test to friends or family and compare who figures out the result the fastest. Challenges like this are not only fun, but they also help improve memory, concentration and overall mental flexibility. And who knows – maybe it’s little puzzles like these that are the key to a sharper mind.