Hi

the ratio of two complementary angles is 3 to 7

Let x and (90°-x) represent the smaller and larger angle

       ||Cross Multiplying to solve

    3(90°-x) = 7x

     270° = 10x

      27° = x, the smaller.  Larger of the complementary Angles is 63°

   27°/63° = 3/7 

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