Hi

  a = (11/4)b



 8(b-15) = (11/4)b-15

 32(b-15) = 11b - 60

 32b - 32*15 = 11b - 60

       21b = 420

         b = 20



     30 = 3(c-5)

     30 = 3c - 15

     45 = 3c

      c = 15, present age

 

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