What is the solution to the system of equations graphed below? Pls Quick

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

For each proportion find the unknown number x 1/5/8=×/15

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read