Question

5 autoturisme si 8 camioane consuma 81 l de benzina la 100 in parcursi ,iar 8 autoturisme si 4 camioane consuma 68 l de benzina la 100 km. Câți l de benzina consuma un autoturism la 100 km? Dar un camion?

Answer 1

5 autoturisme..........8 camioane..........81l
8 autoturisme..........4 camioane..........68l  /x2
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5a..........8c..........81l
16a........8c..........136l
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11a........//...........55l
1 autoturism= 55:11
1 autoturism= 5l/100km

5x5+8c=81
25+8c=81
8c=56
1 camion=56:8
1 camion=7l/100km

proba: 5x5+7x8=25+56=81