Wall painting

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

Result

x =  8.8 l

Solution:

x=2⋅ 1⋅ (4⋅ 2−2⋅ 1.8)=445=8.8 lx=2 \cdot \ 1 \cdot \ (4 \cdot \ 2-2 \cdot \ 1.8)=\dfrac{ 44 }{ 5 }=8.8 \ \text{l}

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