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0,8x+x+[(0,8x+x):2]=270 |*2
1,6x+2x+1,8x=540
5,4x=540 |:5,4
x=100
0,8*100=80 - pierwsza liczba
100 - druga liczba
(100+80):2=90 - trzecia liczba
a=0,8b
c=0,8b+b /2
c=0,9b
0,8b+b+0,9b=270
2,7b=270|*10
27b=2700|:27
b=100
a=0,8*100
a=80
c=0,9*100
c=90