The puzzle that made all 4 contestants of Road to Olympia difficult

In the contest Road to Olympia, the 30-point question in the final round made it difficult for contestant Nguyen Nghia with the following content: "Hung wants to find any month according to the solar calendar where the first and last days of the month have the same day of the week. So what months does Hung need to find to make sure the above condition is satisfied?".

Nguyen Nghia gave the answer: February in non-leap years. This answer is not correct so the right to answer belongs to the remaining candidates. Viet Thai gave the answer: months with 29 days. However, this answer is also incorrect, the other candidates also do not have an answer.

Not everyone can find the answer to this Road to Olympia.

If you find the answer to this riddle, scroll down to the comments to post it and see how many people think the same as you.

Lam Hoang

Source: https://vtcnews.vn/cau-do-lam-kho-ca-4-thi-sinh-duong-len-dinh-olympia-ar933762.html