Question 616921
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Hi, 
If a, b, and c are numbers such that {{{a/b = 3}}} and {{{b/c = 7}}}
  a = 3b  and c = b/7
{{{(a+b)/(b+c) = (3b + b)/ (b + (b/7))= 4b/((8/7)b) = 28/8 = 7/2}}}