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II - x
III - 80% * 2x
2x + x + 80%*2x = 253
3x +0,8*2x = 253
3x+1,6x=253
4,6x=253 / :4,6
x=55
I - 2x = 2*55=110
II - 55
III - 80% * 2x= 0,8*110=88