What is 50 written as a simplified fraction?

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and 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