2/5 - 1/4 = 8/20 - 5/20 = 3/20 = 0.15.
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minus three fifths
One whole minus two fifths is three fifths.
Two and two fifths. Five minus two and three fifths = two and two fifths
one tenths
Two fifths is six fifteenths. Eleven fifteenths minus six fifteenths is five fifteenths, which is also one third.