2l+s+b+l+s+2b=205+178=383kg
(2l+s+b+l+s+2b)-(l+b+2s)=2l+2b
383-149=234
2l+2b=234, l+b=234:2, l+b=117
(2s+l+b)-(l+b)=2s
149-117=32
2s=32
s=32:2
s=16
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l+s+2b+l+2s+b=178+149=327
(l+s+2b+l+2s+b)-(2l+s+b)=2b+2s
327-205=122
2b+2s=122
2b+32=122
2b=122-32
2b=90
b=90:2
b=45
---------------------------------
2l+45+16=205
2l=205-45-16
2l=144
l=144:2
l=72
un sac cantareste 16 kg
o lada cantareste 72 kg
un balot cantareste 45 kg
