It is: 2 and 1/4 minus 1 and 3/5 = 13/20 or 0.65 as a decimal
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six and three fifths
No, one half is 50% and three fifths is 60%. One half also equals three sixths and not three fifths.
Three and four-fifths
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
one fifth = 20% three fifths = 60%