1) a=b+26
(a+b) : (a-b)=152 rest 12
a,b=?
(b+26+b) : (b+26-b)=152 rest 12
(2b+26) : 26=152 rest 12
2b+26=152x26+12
2b+26=3964
2b=3964-26
2b=3938
b=3938:2
b=1969
a=1969+26
a=1995
2) a+b+c=2004
a+b=2c
a=b+c
2c+c=2004
3c=2004
c=2004:3
c=668
a+b=668 x 2
a+b=1336
a=b+668
b+668+b=1336
2b+668=1336
2b=1336-668
2b=668
b=668:2
b=334
a=b+c
a=334+668
a=1002