Someone help me please with this math for 12 points!

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class