Răspuns:
Explicație pas cu pas:
7 vaci ......14 oi ---------182 kg
10 vaci.....7 oi ---------156 kg I ·2 =>
7 vaci......14 oi---------182kg (1)
20 vaci....14 oi ............312 kg (2)
(2)-(1) =>
20-7 vaci ............312-182 kg
13 vaci .................130 kg
1 vaca .........130:13 kg
1 vaca mamanca= 10 kg
Inlocuim in a doua relatie :
10x10 kg .......7 oi ........156 kg
100 kg + 7 oi = 156 kg
7 oi = 156-100 kg
7 oi = 56 kg
1 oaie = 56:7 kg
1 oaie mananca = 8 kg
7 v.........14 o.......182 kg
10 v.........7 o........156 kg | × 2
7 v.........14 o.......182 kg
20 v........14 o........312 kg
13 v........-------........130 kg
1 v.......130 : 13 = 10 kg
7 × 10 = 70 kg........14 o.......182 kg
14 o........182 - 70 = 112 kg
1 o........112 : 14 = 8 kg
