A+b+c+d=770
a+b=c+d
a-b=49
c-d=211
find numbers.

A+b = c+d
a+b = 770/2    ( a+b+c+d = 770)
a+b = 385
c+d = 385

a+b+a-b = 385+49
         2a  = 434
           a  = 434/2
           a  = 217
 a-b=49
217-49= b
b         = 168

c+d+c-d = 385+211
         2c = 596
           c = 596/2
           c = 298

c-d = 211
c-211= d
298-211 = d
           d  = 87

Therefore, a=217, b=168, c=298, d=87

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