12
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18
one sixth
First we convert to the same type, which is twenty-fourths: 6 twenty-fourths + 9 twenty-fourths + 10 twenty-fourths = 25 twenty-fourths or 1 and 1 twenty-fourth.
11/2
If we convert into twenty-fourths we get 9 twenty-fourths + 20 twenty-fourths. So the answer is 29 twenty-fourths, which is just over 6 fifths.