Make n the subject of the formula: m=3n

Can someone me do math because i am having a breakdown rn because i don’t get it

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

Can someone tell me if this is perpendicular? !