Eleven twelfths.
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2/3 + 1/5 = 10/15 + 3/15 = 13/15
One third plus one third equals two thirds.
1 1/2 1 1/2
They would have to convert to same denominators to add. So that would be 8 twelfths plus three twelfths. And that is eleven twelfths. 0.916666667
2/3 x 1/4 = 1/6