Necessary paint

3 kg of paint is enough for 18 m² of area. How much paint is needed to paint the walls and bottom of a swimming pool with dimensions of 25 m, 15 m, and a depth of 1.5 meters? Thank you

Correct answer:

m =  82.5 kg

Step-by-step explanation:

$$\begin{gathered} \sigma =3/18=\frac{1}{6}\doteq 0.1667{\text{kg/m}}^2 \\ a=25\text{m} \\ b=15\text{m} \\ c=1.5\text{m} \\ S=a\cdot b+2\cdot (a+b)\cdot c=25\cdot 15+2\cdot (25+15)\cdot 1.5=495{\text{m}}^2 \\ m=\sigma \cdot S=0.1667\cdot 495=82.5\text{kg} \end{gathered}$$

Try another example