Răspuns:
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Explicație pas cu pas:
Perimetrul patratului=30m×4=120m
d.p.
10m..........3kg
120m.........?kg
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[tex] \frac{10}{120} = \frac{3}{x} [/tex]
x=?
[tex]x = 3 \times \frac{120}{10} [/tex]
[tex]x = \frac{3}{1} \times \frac{120}{10} [/tex]
[tex]x = \frac{3 \times 120}{1 \times 10} [/tex]
[tex]x = \frac{360}{10} [/tex]
x=360:10
x=36 kg.vopsea