Răspunsuri

2014-05-05T23:38:16+03:00
X= numarul de banci

Numarul de elevi este
 2x+6=3(x-3)
2x+6=3x-9
x=15 banci
2·15+6=36 elevi

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2014-05-05T23:41:39+03:00
X-n de banci
2x+6-nr de elevi
(x-3)*3

2x+6=3x-9
2x-3x=-9-6
-x=-15
x=15
2*15+6=30+6=36
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