To solve this problem, we can set up a proportion.
If Stacy can paint 3/4 of the bedroom in 3 hours, we can say:
3 hours = 3/4 of the bedroom
To find out how long it will take her to paint the entire room, we can set up the proportion:
3 hours / (3/4 of the bedroom) = x hours / (1 bedroom)
To simplify this proportion, we can multiply both sides by the reciprocal of (3/4 of the bedroom):
3 hours * (4/3 of the bedroom) = x hours
Canceling out common factors:
4 hours = x hours
Therefore, it will take Stacy 4 hours to paint the entire room.