To account for that strange space in the question, I found the answer to different scenarios for 21 2.
6/212=0.02830188679245283018867924528302
6/21.2=0.28301886792452830188679245283019
6/(21/2)=0.57142857142857142857142857142857
6/(21+2)=6/23=0.26086956521739130434782608695652
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