Math problem: Zhang Hua cut 44 cards of regular triangle, square and regular pentagon with colored paper.
Because the number of angles is even, the number of cards is even, and the number of squares must be even, so that the regular triangle and the regular pentagon can divide the remaining cards equally. So the number of squares is any even number between 2 and 42, and the number of regular triangles and regular pentagons is 44 MINUS the difference of the number of squares and divided by 2.