Răspuns:
primul elev:x+x+8=2x+8
al 2-lea elev:x+8
al 3-lea elev:x
in total au 136 de probleme:
2x+8+x+8+x=136
4x+16=135
4x=136-16
4x=120
x=120:4
x=30 => al 3-lea elev a rezolvat 30 de probleme
al 2-lea :30+8=38 probleme
primul:30+38=68 probleme
a+b+c=136
a=b+c
b=c+8
b+c+b+c=136
c+8+c+c+8+c=136
c·4+16=136
c·4=136-16
c·4=120
c=120÷4
c=30
b=30+8 b=38
a=38+30 a=68
