Răspunsuri

2014-09-10T13:53:24+03:00
83-8=75
75:2=45,5
45,5+8=53,5 cantareste fratele
45,5 cantareste Elena
1 4 1
2014-09-10T13:54:30+03:00
Greutatea elenei=e
greutatea fratelui=f
e+f=83
f=e+8
e+e+8=83
2e+8=83
2e=75
e=75÷2=37,5kg