one (1) can be broken in to fifteens
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Convert the fraction parts to like terms, in this case fifteenths. 2 thirds is 10 fifteenths. 1 fifth is 2 fifteenths. So the final resuls is 1 and 10 fifteenths minus three fifteenths which is 1 and 7 fifteenths.
7.5/15 = 1/2, so there are 7.5 fifteenths in one half.
It is: 3/15 = 1/5
3/15
(6/5) / (1/15) = (6/5) *(15/1) = 6*3 = 18