[tex]x - nr. \: total \: de \: pasari[/tex]
[tex] \frac{2}{5} \times x = 140[/tex]
[tex] \frac{2x}{5} = 140[/tex]
[tex]2x = 5 \times 140[/tex]
[tex]2x = 700[/tex]
[tex]x = \frac{700}{2} [/tex]
[tex]x = 350[/tex]
[tex]350 - 140 = 210 \: (rest)[/tex]
[tex] \frac{3}{7} \times 210 = 3 \times 30 = 90 \: (rate)[/tex]
[tex]140 + 90 + a = 350[/tex]
[tex]230 + a = 350[/tex]
[tex]a = 350 - 230[/tex]
[tex]a = 120 \: (pasari \: de \: alt \: fel)[/tex]
