Question

la un super marchet se afla o cantitate de rosii.dimineata se vinde jumatate din cantitate la pranz 95 kg iar restul de 29 kg se vinde seara .cate kg au fost

Answer 1

total rosii  =xkg.
dimineata =1/2(x)kg.
pranz        =95 kg
seara        =29 kg
---------------------------
x=?

1/2(x)+95+29
95+29=1/2(x)
x= (95+29)*2
x=124*2
x=248kg.

verificare...

(248:2)-(95+29)=0kg
124-124=0kg (ramase in magazin)

1/2(248)=248:2=>1/2(248)=124kg.

Sau:

1/2x+95+29=x
1/2(x)+95+29-(x)=0
(((1/2*x)+95)+29)-x=0
95=95/1=95*2/2
x+95*2 /2= x+190 /2
((x+190)/2+29)-x=0
29=29/1=29*2/2
(x+248)-(x*2)totul /2=248-x/2
248-x/2=0
248-x/2*2=0*2
248-x=0
-x+248=0
-x=-248=x=248

rosii=248kg.