9/15 + 10/15 = 1 and 4/15
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2/3 + 2/5 = 1 1/15
One third plus one third equals two thirds.
No. Two-thirds is (16 and 2/3 percent) less than four-fifths.
12 fifteenths (sure?)19 fifteenths = 10 fifteenths (2/3) + 9 fifteenths (3/5)
1