Răspuns:
Baftă...
Explicație pas cu pas:
7 vaci ........14oi...........182kg nutret
10vaci.........7oi.............156kg nutret / *2
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7vaci...........14oi...........182kgnutret
20vaci........14oi...........312kg nutret / le scadem
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13vaci..........0...............130kg nutret
1. cat consuma o vaca?
130 : 13 = 10 kg nutret
2.cat consuma 10 vaci?
10 * 10= 100 kg nutret
3. cat consuma 7 oi?
156 - 100 = 56 kg nutret
4. cat consuma o oaie?
56 : 7 = 8 kg nutret