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Segunda : b
Tercera: c
1) a=2b
2) c-50=b+50
c= b+100
3) a+b+c=2500
2b+b+b+100= 2500
4b = 2400
b= 600
* a= 2b = 2(600) = 1200
* c-50=b+50
c= b+100
c= 600+100
c= 700