On the blueprint of a house, 33 millimeters represents 8 meters. the actual length of the living room is 6 meters. what is its length on the blueprint?

First, we should calculate the length in millimeters for the blueprint for each 1 meter. 
33 ÷ 8 = 4.125
So, each 1 meter represents 4.125 mm on the blueprint.

Now, we can use this rate to calculate the length of blueprint if the length in real life is 6 meters. Multiply the actual length by the rate.
6 x 4.125
=24.75mm

Therefore, the length of the blueprint should be 24.75 millimeters.