Question

10 gaini si 5 rate consuma 670 kg intr-un an,iar 10 gaini si 3 rate consuma 546 kg.

Answer 1

10g + 5r = 670
10g + 3r = 546
le scadem
  /      2r = 124
r = 124 : 2
r = 62 kg/an o rata
10g + 5 * 62 = 670
10g = 670 - 310
g = 360 : 10
g = 36 kg/an o gaina

Answer 2

10 gaini...5 rate...670 kg
10 gaini...3 rate...546 kg
Metoda comparatiei:
5-3=2(rate in plus)
670-546=124(kg consumate in plus)
124:2=62(kg consumate de o rata)
5×62=310(kg consumate de 5 rate)
670-310=360(kg consumate de 10 gaini)
360:20=36(kg consumate de o gaina)
Verificare:
10×36+5×62=360+310=670
10×36+3×62=360+186=546