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2014-05-04T03:53:44+03:00
A+b+c=150
a=80b/100=4b/5
b=(a+c)/2⇒   c=2b-a=2b-4b/5=(10b-4b)/5=6b/5
deci c=6b/5
inlocuim 4b/5+b+6b/5=150
10b/5+b=150
15b/5=150
b=150·5/15
b=50
a=4·50/5
a=40
c=2·50-40
c=60