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2014-01-30T15:51:24+02:00
3a+7b+4c= 3(20-b)+7b+4(30-b) = 60-3b+7b+120-4b=180
5a+3b+2c= 5a + 3(33-a) + 2(11-a) = 5a+99-3a+22-2a = 121
36 3 36
2014-01-30T16:09:58+02:00
20+20+20+30+30+30+30=180
3a+7b+4c=180
33+33+33+11+11=99+22=121
5a+3b+2b=121
13 3 13