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Brat - 1/2 s - 3
Ala - 1/2 s
siostra - s
67= 1/2s + 1/2s - 3 +s
67 = 2s - 3 /+3
70 = 2s /:2
s = 35
67÷3=22,1-SIOSTRA
22,1÷2=11,05-ALA
22,1 + 11,05=33,15
67-33,15=38,85