(3 1/5) - (1 3/5) : If we borrow 1 from 3, then 3 1/5 becomes 2 6/5 [1 = 5/5, and 1/5+5/5 = 6/5]. Now can subtract 3/5 from 6/5, and subtract 1 from 2:
6/5 - 3/5 = 3/5. 2-1 = 1. So the answer is 1 3/5.
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3 2/5 - 1 3/5 = 2 7/5 - 1 3/5 = 1 4/5
Or...seventeen fifths minus eight fifths is nine fifths, ie one and four fifths.