Răspuns :
a +b +c + d= 52
b= a+ 2
c= b+ 2= a + 4
d=c+ 2= a+ 6
a+a+2+a+4+a+6= 52
4a= 52 - 12
4a= 40
a= 10
b= 10+2=12
c=10+4=14
d=10+6=16
b= a+ 2
c= b+ 2= a + 4
d=c+ 2= a+ 6
a+a+2+a+4+a+6= 52
4a= 52 - 12
4a= 40
a= 10
b= 10+2=12
c=10+4=14
d=10+6=16