Răspunsuri

2014-03-18T14:08:18+02:00
15f+4c=800
12f+4c=680 =>4c=680-12f

15f+680-12f=800
15f-12f=800-680
3f=120
f=120:3
f=40 kg

4c=680-12*40
4c=680-480
4c=200
c=200:4
c=50 kg
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