1 3/15.
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Well, 11 + 7 = 18. 18/15 = 1 and 3/15 = 1 and 1/5.
First we convert them into similar units, giving us 10 fifteenths and 12 fifteenths. Together that is 22 fifteenths or 1 and 7 fifteenths.
three fifteenths
It is 1 1/30.
3 fifteenths minus 5 fifteenths equals minus 2 fifteenths.