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a/6=b/5 = 30=axb = 30/a
dato 2
a/9=30/b = 30a=9b
10a=3b
remplazando dato 1 en dato 2
10a=3(30/a)
10a=90/a
a al cuadrado = 90/10
a al cuadrado = 9
a=3
remplazando
10a=3b
10(3)=3b
30=3b
10=b
a+b
3+10=13