Question 53
Let $ABCD$ be a rectangle. A certain number of red lines are drawn between the lines $AB$ and $CD$, parallel to them, and a certain number of blue lines are drawn between the lines $AD$ and $BC$, parallel to them. This divides the rectangle into $775$ smaller rectangles, while the red and the blue lines intersect at $720$ points. How many red, and how many blue lines are there? (Matko Ljulj)