The Road to Olympia question has no answer yet

In the competition about enemies, the organizers of the Road to Olympia gave contestant Duc Manh a math question worth 20 points with the following content: "A square lawn is surrounded by a fence, with an area of ​​100 square meters. In one corner of the lawn is a tree stump and a cow is standing. A 5 meter long rope is tied to the tree stump. What is the maximum area of ​​grass that the cow can eat, knowing that the area of ​​the tree stump is negligible?".

After thinking for a while, contestant Duc Manh calculated the result to be 25 m² but it was wrong. Then, contestant Vy Hao pressed the bell to answer with the answer 78.54 m², but it was still wrong.

The question Road to Olympia has no answer.

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Lam Hoang

Source: https://vtcnews.vn/cau-hoi-duong-len-dinh-olympia-chua-co-loi-giai-ar940097.html