Respostas

2014-02-09T21:18:20-02:00
N+(n+1)+(n+2)+(n+3)=4*n+72 n=18

n=18  n+1=19  n+2=20  n+3=21
2014-02-09T22:37:42-02:00
Olá

 x+(x+1)+(x+2 )+(x+3)=78
  4x+6=78
   4x=72
      x=72/4
      x=18

 esses números são 18,19,20 e 21