9.6
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twelve fifteenths or four fifths
2.4 is two and four tenths; it could also be described as two and two fifths, or twelve fifths, which we can write as 12/5.
four fifths.
2 / 5 x 12 = 4.8
Twenty four fifths is four and four fifths. So if you take three away, that leaves one and four fifths.