38 iaurt..........14 smantana..................132 lei
36 iaurt............7 smantana..................100 lei /x2
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72 iaurt..........14 smantana.......................200 lei
38 iaurt..........14 smantana.......................132 lei
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34 iaurt..............//......................................68 lei
1 iaurt=68:34
1 iaurt=2 lei
38x2+14 smantana=132
76+14s=132
14s=132-76
14s=56
1 smantana=4 lei
proba: 38x2+14x4=76+56=132