No. 5/12 doesn't reduce to anything.
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No, because if you reduce 12/36 then you get 3 and if you reduce 5/7 you get a decimal, not 3.
Divide numerator and denominator by 6. 30/12 = 5/2
20/12 = 5/3 by dividing the numerator and denominator by their HCF which is 4
The sum of 5/12 and 5/12 is 5/6
The reciprocal of 5/9 is 9/5, since the reciprocal of anything is just switching the numerator and denominator.