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Daca 15 e 30% din x cat e x

Răspuns :

[tex] \frac{30}{100} \times x = 15[/tex]

[tex] \frac{3}{10} \times x = 15[/tex]

[tex] \frac{3x}{10} = 15[/tex]

[tex]3x = 10 \times 15[/tex]

[tex]3x = 150[/tex]

[tex]x = \frac{150}{3} [/tex]

[tex]x = 50[/tex]
30% ...........15
100%............x

X = 15×100 ÷ 30 = 1500 ÷ 30 = 50