Răspuns:
16,42,63
Explicație pas cu pas:
Fie lungimile notate cu L1 L2 L3.
L1+L2+L3=121m
L1+5=L2:2=L3:3
L2=2(L1+5)
L3=3(L1+5)
Inlocuim in suma:
L1+2(L1+5)+3(L1+5)=121
L1+2L1+10+3L1+15=121
6L1+25=121
6L1=121-125
6L1=96
L1=16m
L2=2(L1+5)=2*21=42m
L3=3*21=63m
Verificare: 16+42+63=121