The puzzle that 'knocked out' all 4 contestants of Road to Olympia

In the Finish Line contest of male student Hoang Khanh, a question worth 30 points appeared with the following content: "Mr. Dung has 12 natural numbers from 1 to 12, which need to be divided into 2 groups A and B, so that the sum of the numbers in each group is equal to the remaining group and group A has the smallest number of numbers possible. What is the smallest number of numbers in A? Then, which natural numbers are in group A?"

After thinking for a short time, Hoang Khanh could not give an answer to this question. Immediately after that, the opportunity was given to the remaining 3 contestants but no one rang the bell to answer because this question was too difficult.

The puzzle that 'knocked out' all 4 contestants of Road to Olympia

Try this quiz to see how smart you are. If you find the answer in the shortest time, scroll down to the comments to record and see how many people think the same as you.

Lam Hoang

Source: https://vtcnews.vn/cau-do-danh-guc-ca-4-thi-sinh-duong-len-dinh-olympia-ar937168.html