2/5 + 3/12 = 24/60 + 15/60 = 39/60 = 13/20 = 0.65
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We convert this to twelfths to give: 10 twelfths + 4 twelfths + 9 twelfths = 23 twelfths or 1 and 11 twelfths.
One fourth is three twelfths. So one twelfth plus three twelfths is four twelfths, which is also one third.
six tenths or three fifths
three fifths plus one quarter = 17 twentieths
3 5/8 + 5/12 is 4 1/24.