Respostas

2014-04-25T13:41:49-03:00
10 borrachas : 1,20x10 = RS 12,00

34,40-12,00 = 22,40

RS22,40/14 Réguas = RS1,60 o valor de cada régua.


2014-04-25T13:42:06-03:00
1,20.10+14x=34,40
12+14x=34,40
14x=34,40-12
14x=22,40
x=22,40/14
x=1,60