Răspunsuri

2014-08-10T12:43:47+03:00
18n+20c =90

6n=10c

n= 10c/6= 5c/3

18 *5c/3 +20c=90

30c+20c=90

50c=90

c=1,8 lei costa un corn

n= 5*1,8/3=  5*0,6= 3 lei costa o napolitana
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