7th Grade Challenging Math

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7-79)   Answer

         If A # B = (A x B) / (A + B)
     a) 9 # (10 # 10) = 9 # (100 / 20) = 9 # 5 = 45 / 14 = 3.21
        b) 8 # (5 # 5) = 8 # (25 / 10) = 8 # 2.5 = 20 / 10.5 = 1.905