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2014-08-14T14:29:28+03:00
 a+b+c=345

a:b=5 rest 5

a=5b+5

b:c=5 rest 5

b=5c +5

a=5(5c+5)+5=  25c +25+5=  25c +30


25c+30+5c+5+c=345

31c +35=345

31c=345-35

31c=310

c=10

a=25*10+30=250+30=280

b=5*10+5=50+5=55
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