As simple as possible: 63 * three fifths + 36 * 0.6 + three fifths

63 * three fifths + 36 * 0.6 + three fifths
=63 * three fifths + 36 * three fifths + three fifths
=(63 + 36 + 1) * 3 / 5
=100 * 3 / 5
=20*3
=60

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