Oh, I don’t know that they have changed the online version. But anyway, I think it’s good that they know they have made a serious mistake and are willing to change it. Unfortunately, the same mistake appears again. I would say that this one is less serious (or is not a mistake from the point of view of the question setter), because they have already “approximated” the perimeter of the triangle to 20 cm. (A similar “wrong question” had appeared in the Finals of 1996-97.) Of course, from my point of view, such “approximations” cannot be accepted.

Nice observation, Hon. I was not aware of this mistake when I wrote the solutions yesterday.