Răspunsuri

2014-05-31T12:56:38+03:00
A + b = 250 >> a = 250 - b
20a + 25b = 5500
20(250 - b) + 25b = 5500
5000 - 20b + 25b = 5500
5b = 500 >> b = 100 >> a = 150
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