Question

Dragos si Daria fac cumparaturi de acelasi fel. Dragos cumpara 2kg mere si 5 kg de pere platind 26 lei . Daria cumpara 6kg mere si 7 kg de pere platind 46 lei . cat costa un kg de mere? Dar un kg de pere?

Answer 1

2 kg mere...................5kg pere........................26 lei  /x3
6 kg mere.................. 7kg pere........................46 lei
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6kg mere......................15kg pere....................78 lei
6kg mere........................7kg pere....................46 lei
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//....................................8kg pere.....................32 lei

8p=32
1p=32:8
1p=4 lei    1kg pere=4 lei

2kg mere+5x4=26
2kg mere+20=26
2kg mere=26-20
2kg mere=6
1kg mere=6:2
1 kg mere=3 lei

proba: 2x3+5x4=6+20=26