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the supplementary of 120 =60

the complementary of 60 =30

Therefore:

Ans=30

the complementary of 60 =30

Therefore:

Ans=30

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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 .