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2015-08-02T14:48:45+05:30

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 the supplementary of 120 =60
 the complementary of 60  =30

Therefore:

Ans=30
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2015-08-02T14:55:14+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
supplement of 120 is 60 (since , 180 - 120 = 60)
complement of supplement of 120 is nothing but complement of 60 .
Now , complement of 80 is 30 (since , 90 - 60 = 30)
So , complement of supplement of 120 is 30 .
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