Răspunsuri

2014-10-07T22:28:47+03:00
15a+20b=230
20a+15b=225

15a+20b-(20a+15b)=230-225
-5a+5b=5
5(b-a)=5
b-a=1
b=1+a
15a+20+20a=230
35a=210
a=6
b=7
2014-10-07T22:29:18+03:00
15 kg cap + 20 kg ci = 230 inmultim cu 4
20 kg cap + 15 kg ci = 225 inmultim cu 3
60 kg cap + 80 kg ci = 920
60 kg cap + 45 kg ci = 675 scadem cele 2 relatii
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   /           35 kg cirese = 245 lei
245 : 35 = 7 lei / kg cirese
15 kg capsuni + 20 * 7 = 230
15 kg capsuni+ 140 = 230
15 kg cap = 230 - 140
90 : 15 = 6 lei /kg capsuni