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II bok - x+6
0,8(x+6)+1,25x = x+x+6
0,8x+4,8+1,25x = 2x+6
2,05x+4,8 = 2x+6
2,05x-2x = 6-4,8
0,05x = 1,2 |:0,05
x = 24
I bok - 24
II bok - 24+6 = 30
obw = 2(24+30) = 2*54 = 108
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