What is the main idea of Nights and dragons

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'