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A+b+c=1800
a=b-25
c:b=5 rest 75
a=? b=? c=?


Răspuns :

a+b+c=1800 (1)
a=b-25 (2)
c=5b+75 (3)
Inlocuim 2 si 3 in 1 => b-25+b+5b+75=1800=>7b+50=1800=>7b=1750=>b=250
a=250-25=225
c=250*5+75=1325