What happens when you are focused to the maximum? Your eyes work fast to transport information to your brain, and then this powerful machine in our heads processes it, analyzes it, and stores the important data into our memory!!
You might see one and the answer seems so simple to you but when you find out what the answer actually is, you wonder how you could have fallen so far from the mark. That is the case with this puzzle, and it is stumping people with its simplicity!
Be attentive and take your time, but try to deal with the task as fast as possible.