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Aflati x din proportia: [tex] \frac{2x+5}{20} [/tex] = [tex] \frac{5}{4} [/tex]

Răspuns :

[tex]\displaystyle \frac{2x+5}{20} = \frac{5}{4} \\(2x+5) \cdot 4=20 \cdot 5 \\ 8x+20=100 \\ 8x=100-20 \\ 8x=80 \Rightarrow x= \frac{80}{8} \Rightarrow x=10[/tex]