Eight Fifths
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Nine tenths plus two fifths minus one fourth is equal to 1.05
9/10 - 2/3 = 7/30
3/5 also equals 6/10 or 6 tenths The answer is therefore 6 tenths minus 9 tenths = minus 3 tenths Assuming of course that these portions are from the same object/ number etc. you have 30% less than when you started.
4 tenths
6/10 or 3/5