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2014-10-04T20:39:24+03:00
Alexandra=a
adi=b
andreea=c
b+200=c
a=b+c
a+b+c=1600
b+c+b+c=1600
2b+2c=1600
2b+2(b+200)=1600
4b+400=1600
4b=1200
b=300
c=500
a=800


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2014-10-04T20:42:52+03:00
A= Alexandra
b= Adi
c= Andreea

a+b+c=1600
c=b+200
a=c+b⇒a=b+200+b
b+200+b+b+b+200=1600
4b+400=1600
4b=1600-400
4b=1200
b=1200:4=300
c=300+200=500
a=500+300=800

Verificare:
800+300+500=1100+500=1600  (Adevarat)

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