a student builds an model of her bedroom. the scale is 1:25 in the scale model, the students bed is 3 inches long how long is her actual bed?

The size of actual bed is 75 inches

Explanation:

Scale refers to the ratio of the original dimension to the dimension on paper (miniaturised dimension). Since it is a ratio, it has no dimension.

Scale = original dimension/miniaturised dimension

Given that scale is 1:25

It means that every 1 inch on paper would correspond to 25 inches in reality.

The length of the model bed = 3 inches

Hence, the length of the original bed is 25*3 = 75 inches

∴ Length of the actual bed of the student is 75 inches.