Kevin drew a scale drawing of a boarding school. The scale of the drawing was 1 millimeter : 3 meters. A building at the school is 150 meters long in real life. How long is the building in the drawing?

___millimeters

To find out how long the building is in the drawing, we need to convert its real-life length to millimeters using the scale.

The scale is given as 1 millimeter : 3 meters.

So, if the building is 150 meters long in real life, its length in the drawing can be calculated as (150 meters) * (1 millimeter / 3 meters).

Canceling out the units, we have:

150 meters * (1 millimeter / 3 meters) = (150/3) millimeters = 50 millimeters.

Therefore, the building is 50 millimeters long in the drawing.