Question

dau coroană .rezolvarea prin metoda comparației

Answer 1

2 b.........3r=230
3b...........2r=170
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5b+5r=400=>5(b+r)=400=>b+r=400:5=>b+r=80 lei costa o bluza si o rochie

b+r=80=>b=80-r
2(80-r)+3r=230
160-2r+3r=230=>r=230-160=>r=70 lei costa o rochie

2b+3·70=230=>2b=230-210=>b=20:2=>b=10 lei costa o bluza