Joes electric made 19 customer calls last week and 24 calls this week. how many calls must be made next week in order to maintain an average of at least 20 calls per week for the three week period?

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.