Respuesta :

21, 15, 30
a+b+c=66
c=2b; a=b+6
(b+6)+b+(2b)=66
    -6                 -6
(b)+b+(2b)=60
2b+2b=60
4b =60
(1/4) 4b = (1/4)60
b= 15, which is the second number

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