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Ajutor..please

 
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adriana1972
Arhimede


Joined: 28 Nov 2010
Posts: 7
Location: pe scaun

PostPosted: Thu Mar 10, 2011 11:53 am    Post subject: Ajutor..please Reply with quote

La o termocentrala,dintr-o cantitate de carbuni,s-a consumat in prima luna 0,5 din cantitate si inca 2,5t,in a doua luna 0,25 din cantitate si inca 3,5r,iar in a treia luna restul de 8,85t.Cate tone de carbune a avut termocentrala si cat carbuna s-a consumat in fiecare luna? [/url]
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smecherul100
Euclid


Joined: 09 Nov 2010
Posts: 37

PostPosted: Tue Mar 15, 2011 2:53 pm    Post subject: Reply with quote

fie x cantitatea de carbune (exprimata in tone)
1)dupa prima luna raman x/2-2,5 t
2)dupa a 2-a luna raman x/4 -3,5 t
3) raman 8.85 t
deci x=3x/4 +2.85 t=>x/4=2.85t=>x=11.40
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