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Am gaina albe si negre:2/5 dintre ele sunt albe si 15 sunt negre.Cate gaini am in total?

Răspuns :

5/5-2/5=3/5
15:3x5=5x5=25(gaini)
[tex]x+y=z[/tex]
[tex]\frac{2}{5}z=x[/tex]
[tex]y=15[/tex]
[tex]\frac{2z}{5}+15=z[/tex]
[tex]\frac{2z}{5}+\frac{75}{5}=\frac{5z}{5}|*5[/tex]
[tex]2z+75=5z[/tex]
[tex]3z=75[/tex]
[tex]z=\frac{75}{3}[/tex]
[tex]=>z=25[/tex]