2/3
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First we convert them into similar units, giving us 10 fifteenths and 12 fifteenths. Together that is 22 fifteenths or 1 and 7 fifteenths.
Eleven fifteenths minus ten fifteenths is equal to one fifteenth.
3 fifteenths minus 5 fifteenths equals minus 2 fifteenths.
three fifteenths
1 and 9/10