Final answer:
The length of the miniature couch for the dollhouse, with a scale of 1 inch : 2 feet, is 3 inches.
Step-by-step explanation:
To determine the length of Janie's miniature couch for the dollhouse, we need to use the given scale of 1 inch : 2 feet. Since Janie's actual couch is 6 feet long, we can set up a proportion to solve for the length of the couch in the model.
Using the scale that 1 inch represents 2 feet in actual size, we calculate that every 1 foot in actual size is represented by 0.5 inches in the model. Therefore, for a 6-foot couch:
6 feet × 0.5 inches/foot = 3 inches
So, the length of the miniature couch for the dollhouse scaled at 1 inch: 2 feet would be 3 inches long.