Răspuns :
Maria-27 conuri
Teodor-cu 8 mai multe decât Andrei
Andrei-x conuri
Total-87 conuri
R-re:
27+8+x+x=87 conuri
8+2x=87-27
8+2x=60
2x=60-8
2x=52
x=52:2=26 conuri Andrei
26+8=34 conuri Teodor
R-s:Teodor-34 conuri
Andrei-26 conuri
Maria-27 conuri
Teodor-cu 8 mai multe decât Andrei
Andrei-x conuri
Total-87 conuri
R-re:
27+8+x+x=87 conuri
8+2x=87-27
8+2x=60
2x=60-8
2x=52
x=52:2=26 conuri Andrei
26+8=34 conuri Teodor
R-s:Teodor-34 conuri
Andrei-26 conuri