Wall painting

The wall is 4 meters wide and 2 meters high. The window in the wall has dimensions of 2x1,8 meters. How many liters of color is needed to paint two-layer these walls, if the 1 m2 needs 1 liters of paint?

Correct result:

x =  8.8 l

Solution:

x=2 1 (4 22 1.8)=445 l=8.8 l



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