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1). B=V+R
2). 7+R=V
Reemplazando
B=V+R
B=7+R+R
B=7+2R
En total tengo 50:
B+V+R=50
Reemplazando todo:
7+2R+7+R+R=50
4R+14=50
4R=36
R=9
Tengo:
-). 9 Rojas
-). B=7+2R
B=7+2(9)
B=25
25 Blancas
-). V=7+R
V=7+9
V=16
16 Verdes