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2014-03-19T20:26:42+02:00
A+b=500
a/2=b/4*2
a/2= b / 8 
8a = 2b 
a = 2b/8
a= b/4 
b/4 + b = 500
b+4b /4  = 500
5b = 500 ×4 
5b = 2000 
b= 400 . 
a= 100 . 
2 5 2