Well, one fifth is 3, so two fifths must be 6.
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2/5 + 2/3 = 6/15 + 10/15 = 16/15 = 1 1/15
5 and 6/15 + 2 and 7/15 = 7 and 13/15
12/5ths = 2 and 2/5ths 2 and 2/5ths - 1 = 1 and 2/5th
4/5 of 15 is 12.
1 and 2 5ths would be 7/5