IQ test puzzles that only smart people can answer

Using your calculation and reasoning skills, complete the task of finding the answer to this puzzle.

Maybe you don't know, this seemingly simple question has "knocked out" many people because of haste and lack of concentration.

Be calm and conquer this interesting question.

Can you answer this question?

The answer seems to be hidden behind the hints. Pay close attention and you will find it.

Quickly register yourself in the top smartest people by leaving your answer in the comment box below.

Trung Temple

Source: https://vtc.vn/cau-do-kiem-tra-iq-chi-nguoi-thong-minh-moi-tra-loi-duoc-ar831336.html