How do you go about simplifying 16/80

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

Which diagram shows lines that must be parallel lines cut by transversal?

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30