The numbers of sides of two regular sides of two regular polygons are in the ratio 2: 1 and their interior angles are in the ratio 4: 3, find the sum of the number of sides of the polygons.
The numbers of sides of two regular sides of two regular polygons are in the ratio 4: 5 and their interior angles are in the ratio 15: 16, find the difference in the number of sides of the polygons.