Riddles are challenging riddles that require the reader to find a hidden or lost object. These riddles are thought-provoking and can help awaken your hidden intelligence.

Trying out brain teasers is a great way to de-stress, boost your brain, and improve cognitive skills and critical thinking.

Puzzles often require you to look closely at images or text to find hidden objects or patterns. This can help improve your short- and long-term memory, visual acuity, and attention to detail.

Solving puzzles can give you a sense of accomplishment and satisfaction. This can improve your mood and make you feel more positive.

If you are looking to test and improve your cognitive skills, you must try this brain teaser now!

IQ Test: Find the correct color order by looking from above in 5 seconds!

## Find the missing number in 7 seconds

Source: Pinterest

In the image shared above, you can see a 3*3 number grid containing multiple numbers.

The challenge for readers is to find the missing number on the grid.

This brain teaser will test the sharpness of your brain.

Can you find the missing number in 7 seconds?

Your time starts now!

Look at the image and study it carefully.

You must have an alert mind to quickly determine the missing number.

Have you identified the missing number?

Study the image carefully to determine the pattern.

Hurry up; time is running out.

AND…

Time is over.

Were you able to spot the missing number within the time limit?

Congratulations to those readers who have determined the missing number.

You have a very intelligent brain.

Those who couldn’t, can scroll below to find the solution.

## Find the missing number in 7 seconds: solution

The missing number can be calculated as follows:

4 + 8 * 2 = 20

9 + 3 * 2 = 15

Similarly,

6 + 6 * 2 = 18

Therefore, the missing number is 18.

If you loved solving this brain teaser, share it with your friends and family and see who performs the best!

Also, check out some more interesting challenges in our recommended reading section below:

### Recommended reading

Optical Illusion Vision Challenge: Find the group thief in 7 seconds!

Seek and find: Find the number 81 in 6 seconds!

Categories: Optical Illusion

Source: sef.edu.vn