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nine tenths
27/30 - 2/30 = 25/30 = 5/6
The sum of (eight and nine tenths) plus (nine and eight tenths) is (eighteen and seven tenths). 8.9 + 9.8 = 18.7
Nine tenths minus four tenths is five tenths, which is also a half.
nine tenths is 90% and four fifths is 80% so nine tenths is bigger