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Paisprezece vaci consuma in 5 zile 840 kg hrana . Cat vor consuma 10 vaci in 12 zile ?

Răspuns :

14 vaci...........................5zile 840 kg hrana
10 vaci...........................12 zile x kg
840:5=168 kg 14 vaci / zi
168:14=12 kg consuma o vaca / zi
10*12=120 kg consuma 10 vaci / zi
120*12=1440 kg consuma 10 vaci in 12 zile