Garage painting calculation

How much paint does Peter use to paint a block-shaped sheet metal garage (without the lower base) with dimensions of 8m, 5.5m, and a height of 2.5m, if 1kg of paint is enough for a 4m square area?

Final Answer:

m =  27.875 kg

Step-by-step explanation:

$$\begin{gathered} a=8\text{m} \\ b=5.5\text{m} \\ c=2.5\text{m} \\ h=1/4=\frac{1}{4}=0.25{\text{kg/m}}^2 \\ S=2\cdot (a+b)\cdot c+a\cdot b=2\cdot (8+5.5)\cdot 2.5+8\cdot 5.5=\frac{223}{2}=111.5{\text{m}}^2 \\ m=h\cdot S=0.25\cdot 111.5=27.875\text{kg} \end{gathered}$$

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