Here is a problem that I recently had to solve and I really liked it. I recommend it to all Maple fans:
"The contour of the Christmas tree on the occasion of the New Year 2022 is a triangle, which is divided into 7 small triangles, the bases of which are parallel. The areas of triangles and the star are measured in snowflakes, the values of which are presented on the balls (of course, the number of snowflakes must be integer). It is necessary to determine the areas of triangles, on the balls of which there are no numbers".
At first glance it seems that the area of the star is not related to the problem, but it is not. This will become clear only after the problem is solved.