What is the answer to this question? x/5 - 13 = 20

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.

Plz hurry evaluate the expression a+b where a=8 and b=19

Pls the last one and it has to be like number 6