Answer:
7.0833 inches
Step-by-step explanation:
As Emily's room in the dollhouse has its dimensions as a scale of Emily's room, we can solve this problem using rule of three:
The room has 12 feet long, and its scaled room has 8.5 inches long, so if the room has 10 feet wide, the width of the scaled room is X:
12 feet -> 8.5 inches
10 feet -> X inches
12/10 = 8.5/X
X = 10 * 8.5 / 12
X = 7.0833 inches