Block-shaped 31741

We will paint the block-shaped pool, with the dimensions of the bottom a = 25 m and b = 15 m and the height c = 3.5 m. If one kg is enough for five square meters of paint, how many kg of paint will we need?

Correct answer:

m =  131 kg

Step-by-step explanation:

$$\begin{gathered} a=25\text{m} \\ b=15\text{m} \\ c=3.5\text{m} \\ h=5{\text{m}}^2\text{/kg} \\ S=a\cdot b+2\cdot (a+b)\cdot c=25\cdot 15+2\cdot (25+15)\cdot 3.5=655{\text{m}}^2 \\ m=S/h=655/5=131\text{kg} \end{gathered}$$

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