Question

daca 6 tricouri si 7 bluze costa 523 de lei, iar 6 tricouri si 10 bluze costa 652 de lei, cat costa 2 bluze si 5 tricouri?

Answer 1

tricou = t
bluze = b

6t+7b = 523
6t+10b=652
2b+5t=?

 \left \{ {{6t+10b=652} \atop {6t+7b = 523}} \right. => 3b = 652-523=129 => b=43
 
6t+7b=523 => 6t+7*43=523 => 6t=523-301 => 6t=222 => t=222/6 => t=37


2b+5t=?
2*43 + 5*37 = 86 + 185 = 271 lei costa 2 bluze si 5 tricouri !

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