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Sase muncitori termina o lucrare in 5 zile.Afla in cate zile pot termina aceeasi lucrare 2 muncitori?

Răspuns :

[tex]6muncitori................5zile[/tex]
[tex]2muncitori................x zile[/tex]
--------------------------------------------[tex]i.p.[/tex]

[tex]\frac{6}{2}=\frac{x}{5}[/tex]

[tex]\frac{x}{5}=3[/tex]

[tex]x=3*5[/tex]

[tex]\boxed{x=15~(zile)}[/tex]


[tex]Raspuns:~in~15~zile[/tex]
6/2-(x/5)=0
6/2-x/5=0
3-x/5=0
3=3/1=(3*5)/5
3*5-x     15-x
------- =--------
  5           5
15-x
------- =0
   5
15-x
------ *5=0*5
   5

15-x=0

-x+15=0
-x=-15
x=15